I think villain should absolutely be jamming flopped flushes here, but for a different reason: now is the time for villain to try to get value before an action-killing fourth spade rolls off on the river from (1) our two pair/sets with his flushes (nut flushes on down to baby flushes), AA, or JJ or (2) his nut flushes trying to overflush us. I don't think
@Legend5555 has all that many flushes, as his analysis has suggested, so even villain's baby flushes (what's his babiest flush? 8s7s? 7s6s?), AA, and JsJx can jam pretty safely. I don't think villain should be worried about denying equity/getting sucked out on on the river, more so that now is his best chance to get paid and the stack depths/pot size allow this play in a way that the flop didn't. I know I said that villain's range doesn't have all that many flopped flushes on the previous streets, but the bet-call flop line and raise-jam turn line truncates that range significantly. A lot of other hands in villain's range should be falling out. I think with the turn price you're laying, KsKx and QsQx seem just so incentivized to call rather than turn themselves into bluffs, though maybe bluffing those hands is the correct play trying to fold out your non-two-pair/non-spade-draw AxXx. If villain does have KsKx or QsQx, I love this line from them, cause they've realized they don't have all that much showdown value and they're genuinely putting top-pair-plus to a hard decision. Similarly, AxKs and AxQs are might just call thinking that they already have the best hand or are chopping and free-rolling the spade. A5 or A3 suited from villain seems like a gross overplay, but who among us hasn't made gross overplays. And villain can always have just the most non-sensical air here, as many strategy threads here attest to.
I just think, on the whole, villain's hands that we were targeting through our flop x/r and turn continue aren't incentivized to take this line, and we're unusually likely to see AA, JsJx, and flopped flushes. I think all of those hands have to jam rather than call with the SPR. In my pool (which might differ from OP's!), turn raises are underbluffed spots, particularly in more straightforward situations like monotone flops IP. It's annoying that we're not gonna have all that many better hands to call with (a few flushes, 55, maybe 33 but I also might just fold that pre), and that irks me. I'm probably finding a fold here. But we're getting a good price and I don't think a call is a spew, provided you're calling because you think villain is capable of turning KsKx and QsQx (plus AxKs and AxQs as mergier/marginally-higher-equity versions) into bluffs at a high frequency.