Hazarding a guess it looks like it might be bolted to the frame. If you can get underneath, do you see the other end of those bolts? I'm curious if it might be structural in a way.

Those look like bolts holding the posts to the frame. Those posts are load bearing. Don't mess with them!

im going to reframe the single 2x3 stud to either side with a carry plate. not super worried about that.

they are 9/16th heads, i backed off one, and are surprisingly long, frame is steel though, so a bit confused on that. everything is covered underneath with vap. barrier/insulation between frame rails. *forgot to mention threads are wood threads

https://imgur.com/a/d4CtIwv

perhaps this? https://bayarearetrofit.com/cripple-wall-floor-connectors/

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