I call not super happy because of the straight draws coming in but there isn't that many monsters he can hold. KT makes perfect sense, sets even fish may raise when the double flush draw comes in (although we will see them from time to time), and JJ/AT cease to be a worry once he shoves.
We can expect to see busted flush draws at least the 35% of the time we need over 56/KT or the occasional Kd9d/KdJd. His passiveness makes him not raising his draws more likely yet even passive fish can bluff their rivers with busted draws. It's so common to see someone too passive to raise their flush draw on the flop yet capable of bluffing
it when it bricks the river.