What happened so far, in a nutshell:
was running windows 10 with a 500g and 2 2t hard drives
500g died and new one installed along with bazzite
formatted one of my 2t hard drives into btrfs
installed fallout on my 2t hard drive
made a new admin user and deleted the first one
restarted the computer and now steam doesn't recognize the 2t hard drive containing fallout