Patched Sync for Reddit still works, but using Relay for Reddit now tells me to use the official app to browse mature content.
A couple of notes: being a mod does work around this block. It also appears that reddit is blacklisting NSFW from an explicitly defined list of client ids, meaning Revanced-patched apps are not affected at all and you don't have to be a mod.
I uninstalled Relay yesterday. It was a good decade but time to move on.
I get that there are workarounds to patch apps and bypass NSFW which I could very easily avail myself of, but the more I consider it the more this whole drama has put me off Reddit as a platform, and really any centralised platforms. I could still use them but I just don't want to.. staying as an active user just feels like tacit endorsement of communities being decimated by a company that doesn't even pay the folks that actually keep them going.