If that's the case, then that also doesn't work. With it on, if it was supposed to show only NSFW content, I'm still seeing SFW content.

BUT. After checking it again, I only just noticed that with NSFW on, it unblurs NSFW images if it has it. Since I have set to blur NSFW posts. I think I got it now.

I was hoping it is a selective temporary filter that hides NSFW fully that I can turn off and on depending on my mood.

Thanks for helping me figure it out. I guess I'll leave this post up for posterity's sake.

Edit: or maybe I'm slightly misreading your comment in my first paragraph. English is hard.