That's pretty neat! Thanks for sharing. NSFW in general has so much "inertia" in terms of users. If NSFW migrates elsewhere then that's a sure sign of times changing (IMO).
There are quite a few furry/yiff art on yiffit.net instance.
But, to view nsfw art on lemmy, afaik, you must log into a lemmy account on an instance that supports nsfw (notably, lemmy.ml doesn't supoort nsfw, but beehaw.org does so you're safe), you also need to enable nsfw in your account settings.