That seems to be the case. Ditch IG and let them come to Fedi instead. There's room for sex positive people, positively.
EDIT
Yet this is also another casualty of shittification, so what would we expect? Meta is all over the place with their moderation. I still have a FB account and occasionally I'll receive warnings for posts I made 5-10 years ago. No link to the post, no arguments, no real recourse. While I kind of don't care, a part of me does. I wonder what innocuous thing someone at FB didn't like on my friends only visible account (which probably really isn't that way because FB sucks).
I don't really see any sex positive accounts on instagram, all I see is a flood of spam accounts trying to promote their OF, and I'm happy to see those go. It doesn't matter what the topic is, they're just spam accounts and nothing else. If anything, I would expect, and hope, it's instagram cracking down on that and a few legit accounts got caught in the crossfire.
Just like the discourse to sanitise pride so it's family friendly, all this is about is trying to make their platforms "family friendly" to attract advertisers and that's it.