Your line is fine. Preflop seems thin against this guy. I would probably call and not 4b.

I slightly prefer call pre instead 4betting.
XCall down or bet bet vs any passiveness.

I agree with calling pre vs 4betting.

I know 58 hands is very limited sample but villain appears to be super nitty indicating his 4b calling range is super tight. I would say AK+ QQ+. If he is a bit looser you could add JJ and AQs but I doubt it.

This range has strong eq on this flop and I can see is ever getting the money in ahead.
I like the x on flop for pot control. Turn is fine after flop xb.

River is too thin though imo. When we have to A of spades we don't expect him to have any flushes but he is also never folding a chop or better and he doesn't really have any worse hands to call unless he has AQ or JJ which is very unlikely.

Fwiw vs 25/19 river jam is fine

Nice line, I think you played it perfect. personally I would c-bet flop with most of my AK, but with the As in our hand I don't mind the check. Turn I would be going little bigger so we don't have a big sizing OTR left, now that the flush comes through villain might fold or not, but I think on 10NL people aren't capped at AK/QQ+ because their 3bet range will be more garbage then nuts if they just call a 4bet and play it this passive. wouldn't be surprised to see him 3bet/call 4bet with AJs+/KJs+/JTs+/+mix of PP/SC