Late 2015 iMac internal Fusion drive doesn't boot. Disk Util shows it as "uninitialized"

Well, today is a horrible day. My trusty iMac, which never gave me a problem since I bought it in 2016 (late 2015 model) booted up to the circle with the line across. I booted into recovery, launched disk utility, and I couldn't believe what I was seeing because it didn't make any sense. This iMac has a 3 TB Fusion drive with the SSD being 128 GB. Disk Utility was showing me that the main drive was 4.14 GB, which doesn't make any sense. Just in case I made a Monterey bootable USB stick in my MacBook Pro and booted from it, but same thing. You can see a photo of it below.

I know that mechanical drives can fail pretty fast, but up until last night, it gave me no indication, and last time I ran a first aid on it was a few days ago and it was fine. And I don't know if diagnostics mode checks for drive problems, but I booted into it and told me everything was OK.

I don't know if maybe I was hacked, but in those cases usually they don't ruin your drive, they encrypt your drive and demand a ransom, which hasn't happened.

I'm not going to take it to an Apple Store, I have a Mac Studio coming in June, and I have my MacBook Pro in the meantime. At most, I would spend around $300 in the cheapest macsales.com replacement SSD and kit so I can still use it until I get the Mac Studio.

Has anyone seen this behavior? Does the fact that it shows 4.14 GB as the HDD mean that it is toast and the files can't be recovered? Or is this some kind of logical error with the boot table or something like that?