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It's RAID of the mdadm variety. The system motherboard has a RAID controller on it, and there's support for RAID in the BIOS.

I wasn't the person who set up the RAID, and while I asked for the RAID to be broken (it wasn't), I wasn't the person who actually removed the secondary drive from the RAID ...

Yes, but sadly I ran it searching for Intel partition info rather than EFI GPT. I only got wise to my error after I ran photorec and it reported finding an EFI GPT partition.

So I'll try testdisk again after I get home tonight. I was hoping to get some info on next steps and gotchas before everyone ...

I removed a drive from a RAID 1 pair, meaning to use it to install Windows on. So I deleted the ext4 partition, then created a new NTFS one. Then I deleted that as well to have a clean disk to install on.

Sometime later I managed to pretty thoroughly mung the remaining RAID drive, losing /home in ...