I can confirm this. The search term alluded to, as well as all hashtags stemming from it, have been auto-tagged as nsfw in HashPix as well.
OT: We have just managed to carry out a conversation about a word that was not even mentioned once within the conversation itself. And yet, each one of us knows exactly which word we are alluding to. Voldemort, anyone? :)
I agree though, imo the word you're thinking of is probably banned and the linked list is not a complete/exhaustive one.