Update 2: Black Friday deals on 4 TB SSD [NVMe PCI4 7300 MB/s 2280] for $230 at MicroCentre (US) - so upgraded from a 2 TB drive - was needed anyway. Didn’t want to mess with a drive that could be questionable - not for $230 plus the week of restoring and re-configuring.
Update: using a Live USB, it’s a bad SuperBlock, can’t repair it. Looks like the SSD is fried.
Update 2: Black Friday deals on 4 TB SSD [NVMe PCI4 7300 MB/s 2280] for $230 at MicroCentre (US) - so upgraded from a 2 TB drive - was needed anyway. Didn’t want to mess with a drive that could be questionable - not for $230 plus the week of restoring and re-configuring.