Who says they are T. Rex teeth anyway? That sounds like the very first unsubstantiated assumption in an article that piles them on one on top of another, until it becomes a pile of pishtosh.
I think the story quotes “Haruo Saegusa, a curator at the Museum of Nature and Human Activities.” Maybe Haruo is wrong and it isn’t a T Rex tooth. But I think quoting an evolutionist and their conclusions is fair game. Haruo think its T Rex.
From the article: "the teeth came from a 15-foot-tall dinosaur entombed in early Cretaceous rock, supposedly deposited 140 million years ago."