This seems like worse than usual ASIN hijacking.
Unfortunately, Amazon treats product listings a bit like a winner take all Wikipeida page, that anyone can add themselves as a seller to, and can take complete control off if they are the top seller or if they make a trademark claim, however valid or bogus. And taking over listings is a specialty of Chinese sellers who are experts at stealing listings with positive reviews and substituting their own product for the one that has all the good reviews.
Here’s a random post from Amazon’s seller help forums from 2018 (because this has been an issue for years on Amazon):
