Its a new rear mech, but looks offline to me. Not sure if its bent or if its the hanger

Try a different mech?
Still leaning? Its the hanger…

mines as bad as that and doesn't skip a beat.
wouldn't worry about it.

Mine's similar to that, if not a bit more of a lean. Runs fine.

PS – mow that lawn, spot of weedkiller on the slabs and plant something… anything in the garden!

o'raps a tiny bit, not enough to throw gears out.

I do think those SLX mechs are little bendy. Mine spotaneously bent the other week for no apparent reason. They do bend back though! Looks alright in the photos.

Mech looks fine. You should be more worried about staying out of A&E with them tyres on!