Flop bet is a little too big imo but whatever. It's not like a T or FD is folding to the psb and 44-99 might fold anyways to a half pot bet 4 ways.
Can't fold turn vs that price. River decision your suits actually matter a lot. Having the As is good thing here. But I'd probably fold even with the As.
I can't find a single bluff except 45s not spades or maybe 65s but those should be folding pre to the 6x preflop open and 65s should be folding the flop vs this large cbet, or he's turning some pair like 88 that decided to call flop, into a bluff. Basically he's gotta be super creative and super loose pre/post to have any bluffs here. Congrats to him if he found a bluff