

The property itself still seems toggle-able with the api. The changelog and pull linked seem to be only on the default front end. I don’t see an associated change with the back-end which is mentioned in the PR. If web tools are enabled, the toggle shows up for creating a post. If you add nsfw=true as a parameter in the submission URL it is marked appropriately, but it is not set by default. https://lemmynsfw.com/post/23232239 (This seems to have caused issues elsewhere too).
After playing around with it. the posts don’t show up unless nsfw is enabled, but if you have nsfw enabled the post does not have the visible nsfw marking. If you don’t blur NSFW posts, there is no visible way to know it is NSFW
TL;DR It is treated as NSFW, but it is not visibly marked as NSFW.
Similar to nitro for a user, but for a server as a whole. At various levels it add features to servers. Bigger files, more sticker slots, Banners, animated server icons, higher quality streaming, more options for invite links and how they appear…