I'm still able to on Relay. The dev announced he has to move to a subscription model but its still free for the time being and seems to work fine still.
I am Relay too and just checked. All NSFW posts are now gone. A "Go to Reddit to view mature content" post is all that returns.
Gaddamit reddit. I really hope they burn and they end up in business text books in the future to teach future CEOs how not to run a company.
If you become the mod of a subreddit, you can still get NSFW content through the still functioning third party apps. Just create you own subreddit. Not exactly sure why it works, something along the lines of moderators still need to view NSFW posts or something like that. Wierd how they say you need to use the official app to verify your age, but there is no age verification on becoming a moderator.