The Diagon stuff was just a unique set of circumstances behind it: Disney just barely starting to get off its ass so people were rooting Universal on, Comcast buying out Blackstone, a replacement for Jaws, big rumor mill, etc. Plus Nintendo has some big hampering effects: language barrier, social media barrier, COVID, and more.
Hell I'd argue nothing has topped the hype of Hogsmeade, Carsland, and Diagon yet - not even SWGE.