3betting BTN at 18% isn't that wild if they're just not flatting the button (which is a defensible strategy).

4betting this combo, on the other hand, is wild. The preflop sim I have (which isn't perfect, but it's something) is 4betting 0% of KK without two suits or an ace (and that's versus a 14.8% 3betting button).

Less computationally: three of a suit always hurts and this combo unblocks AA and is far from the most playable. And if we get 5bet, we're in horrible shape almost always.

As-played, your flop rationale is fine.

I don't like anything about the turn bet, though. If you had AA, you wouldn't bet it: it's virtually invincible (no need to deny equity) and it's unlikely to win you much money because villain will assume you're very AA-heavy even if they have a flush or 3xxx (in a 3bet/call range? maybe, I guess). Even 99xx isn't happy (but again, how many 99xx are 3bet/calls?)

That's to say: your bet doesn't actually rep AA well if you're playing AA well (imo).

And if there was ever a turn to give up on, Ad is probably it. You unblock too many calls and you have basically no path to winning at showdown against a call.

As-played, river check/fold is pretty obvious imo.

Im not a fan of the 4 bet pre and would fold to 3 bet as a standard, as an exploit I still don’t like 4betting a hand with 3 of our suit ... on the flop I would want a diamond in my hand to bet it ...

Caution on using the 18% 3bet from BTN stat over 346 hands. That's 3 betting twice over 11 times when villain faced an open on BTN.