Is my SSD fried or did I screw something up when attempting to wipe and reinstall OS?

Question

I’m stuck and need suggestions about what’s wrong. 2011 MacBook Pro 8,2 >Replaced HDD with SSD in Feb 2018.

It started yesterday when I was unable to login to computer user account after low battery shutdown and was unable to login via known password from either user. I noticed a new user account had been setup with name formatted like recovery key.

I tried to reset password via Terminal and it wouldn’t accept password from either user and got message that iCloud had not been setup (although it definitely had). I ran Apple Hardware Test and found no errors. So I decided to just erase SSD and reinstall macOS using Command-R.

Erased SSD volume via Disk Utility and then completed successful OS Reinstall of High Sierra. Setup new user account and opted to use FileVault with iCloud recovery but not iCloud backup. Selected option to restart and install updates via App Store when prompted. Installed updates and restarted a time or two.

Logged in under new username and got stuck at gray prohibitory screen. Restarted laptop again and went into Command-R recovery mode using Internet Recovery. Used Disk Utility and verified SSD volume was ok. Repaired via Disk Utility for good measure.

Restarted again in normal mode and got stuck at gray blank screen, before user login screen appeared. Restarted again in Command-R recovery mode using Internet Recovery. Again verified and repaired SSD in Disk Utility. Noticed no boot drive listed under Show All Devices.

Attempted to erase SSD in Disk Utility to install again without FileVault encryption and got a disk object invalid or unable to serialize error. Attempted to repair, but option was grayed out. Selected Show All Devices option and SSD disappeared from view.

Opened Terminal and ran diskutil list and was unable to find SSD (disk0 was not listed). Back to Disk Utility and still nothing available, so restarted again under Command-R recovery mode. Different MacOS Utilities window opened, with same options except older (Reinstall option was for Lion, not High Sierra). SSD still not showing up under Disk Utility or Terminal list command. Restarted again to same MacOS Utilities window and Disk Utility showed SSD. No option to verify or repair volume. Terminal list showed SSD (as /dev/disk0). Attempted to use Terminal to verify disk0s2 (s1 was EFI), but got error starting file system verification for disk0 unrecognized file system (-69846).

Tried to use Terminal to unmount and re-mount the disk before attempting another verification and repair with diskutil eject /dev/disk0 and got an error that the command timed out. Tried again and got an error that it was unable to find disk. Terminal diskutil list then also failed to show disk0.

Restarted again to Option-Command-R and successfully started up from Internet Recovery. Still no SSD listed – only shows OS X Base System (Disk Image Volume as device disk0s1).

Back to Terminal, diskutil list, shows:

/dev/disk0 (disk image):
#:    Type   Name                      Size        Identifier
0:GUID_partition_scheme      +2.1 GB    disk0
1:Apple_HFS OS X Base System 2.0 GB disk0s1
/dev/disk1 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +5.2 MB          disk1
/dev/disk2 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +524.3 MB     disk2
/dev/disk3 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +524.3 MB     disk3
/dev/disk4 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +524.3 MB     disk4
/dev/disk5 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +2.1 MB          disk5
/dev/disk6 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +524.3 MB     disk6

...through disk18

Restarted again to Option-Command-R and successfully started up from Internet Recovery.

Disk Utility shows Not Mounted 1TB capacity AFPS Volume with SATA connection named disk2s1 that is encrypted, can be verified and repaired not writeable and S.M.A.R.T. status is not supported.

Terminal diskutil list now shows:

/dev/disk0 (internal, physical):
#:    Type   Name                      Size        Identifier
0:GUID_partition_scheme   *1.0 TB        disk0
1: EFI      EFI                            209.7 MB  disk0s1
2:Apple_AFPS Container disk2 1000.0 GB disk0s2
/dev/disk1 (disk image):
#: Type   Name                       Size      Identifier
0: GUID_partition_scheme  +2.1 GB  disk1
1:  Apple_HFS  OS X Base System 2.0 GB disk1s1
/dev/disk2 (synthesized):
#: Type   Name                       Size      Identifier
0: AFPS Container Scheme - +1000.0 TB  disk2
                Physical Store
1:  APFS Volume   Feb 2018 SSD 11.4 GB disk2s1
2: APFS Volume    Preboot          46.1 MB disk2s2
3: APFS Volume    Recovery         1.0 GB. disk2s3
4: APFS Volume    VM                  4.3 GB   disk2s4
/dev/disk3 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +5.2 MB       disk3
/dev/disk4 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +524.3 MB     disk4
/dev/disk5 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +524.3 MB     disk5
/dev/disk6 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +524.3 MB     disk6
/dev/disk7 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +2.1 MB        disk7
/dev/disk8 (disk image):
#:    Type   Name         Size                Identifier
0:                untitled     +524.3 MB     disk8

…through disk20

Any ideas?