What do you mean "it actually is NSFW"? What's NSFW about it?

It's not that people might read it over your shoulders and be offended. It's the fact that it's gross and some might not like being exposed to it. Keep in mind there's been multiple reports about this post.

Someone may stream their screen while reading

This is a shitposting sub. There's lots of stuff that lots of people don't want to read. Doesn't mean every post needs to have a description of what will be in the post. And marking it as NSFW just devalues the point of NSFW