So long as you make a note it's not fishy. You're paying for information while hopefully picking off enough bluffs to minimise losses or even turn a profit. If you know he can click it back with a flush draw on Axx vs the pfr, then check a made but vulnerable flush on the turn, you can play hands against him better in the future. Good quality notes have real value.

If he raises flop more than a minraise, that's probably a made hand like a set or 2pr rather than a draw. That's the first bit of useful information I can take from this hand. I can also fold rivers in future with just a pair in similar lines without a problem, though we'll still have to bluff catch with AK/KK+ because we beat at least some of his value range as well as bluffs, we can't just fold every non-flush hand otherwise we're just going to get trampled over. Especially since we pretty much never have a flush here after we check river over to him. AK/KK/AA is the top of our range here.

I want to play against this guy more. He's playing very specifically rather than in a balanced way. In his shoes, if I decide to raise this flop, I raise it the same as if I had a set or 2pr. Though I probably just call this draw and raise my nut and combo draws. Still, when I bet or raise, my sizing tells you nothing about my hand. At least that's what I'm trying to do. This guy isn't doing that, which means over a large sample size, you can get this guy in your pocket.