We know that it's legal in Japan but it's still a questionable practice otherwise it would be legal
everywhere. For example, the Nevada State Athletic Commission allows it but recently they've been contemplating on whether to ban it. The NSAC director recently asked Russ Anber if he thinks it should remain legal. His answer was
absolutely not. Anber is a veteran with over 40 years experience wrapping hands. Other trainers have taken issue with "stacking" wraps before. Abel Sanchez did with Canelo when he fought Golovkin. It's a genuine concern.
I do, however, agree that it's quite late in the game to raise the issue now. Fulton's trainer has known about it. Why bring it up now? Possibly just to get inside Inoue's head. Hopefully that's all this is.