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.
NSFW is still loading in the Narwhal app, as far as I know.