No, as far as I have heard it is just about stories with excessively long tags. The tl;dr of why this happened: there is someone in the Mo Dao Zu Shi fandom who has a story that they update daily, and was hella over tagged. Like, ~7k words worth of tags. It's not a ficlet collection afaik, just a very long porn fic. Qhen people complained that this fic that was always at the top of the search had unnecessarily long tags, the author threw a snit and made the tags longer, and also made it a crossover with other fandoms, so people eg in the BTS fandom are going "...why is there a mdzs fic here. ...WHY AM I STILL SCROLLING THROUGH THE TAGS?". And then explosion of people making things with absurdly long tags to... annoy? ao3 into dealing with the situation.