Does this board from an old IBM PS/2 80 count as a regular non-SATA board, or is it graded differently?

In my experience, these have been higher grade "non-SATA".
I like to think of the category as anything that predates SATA, as really what they are trying to do is segregate the SATA boards, as they are the ones that are lower value to boardsort.

Also, welcome back kgryczan. It's been a while since you have posted on here, how's everything on your end?

I used to post here regularly until 2015. That was when I got let go from the job I had at that time due to staffing cuts. I got a new job a couple months later fixing printers, but got promoted at the company to do enterprise software support when the customer I was fixing printers for signed a huge contract that included the software that I was going to be supporting. Been doing that since then.

Is that yellow box a battery?

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort

Fixing printers, that sux. Congrats on the promotion and (I assume) newly acquired cash reserves!
Marked, the box is a voltage relay.

That looks like a mother lode of monolithic ceramic capacitors.