Modders-Inc posted a review on the Enermax Liqtech TR4 280 AIO Video
A quote from the article:
When Threadripper hit the streets, there was quite a bit of concern as to how you would cool such a large chip, especially since AMD’s solution was to adopt a standard Asetek all-in-one cooler on top, giving less-than-full coverage of the IHS.Enermax Liqtech TR4 280 AIO Video Review
So while normally a new CPU platform launch means new mounting plates for existing cooling solution, AMD’s TR4 required physically larger coolers