That’s what it looks like. There are a lot of NSFW subs that didn’t get banned, and some that got banned that weren’t NSFW like /r/narcissisticabuse. All marked as for “being unmoderated”. If they were actually banning NSFW subs, you’d think they’d say so.
You could try putting up a cloudflare proxy and Turnstile (their captcha product) to try to help with it.
The truth is, though, if it’s static content, then you have to be able to stop them every time. Once they get it once, they got it. With how frequently they can try, it’s going to be difficult to stop them.