Welllll..... My guess is that the problem is with the interpretation of the evidence. Say the Mastodons died 130,000 years ago and their bones were broken 10,000-15,000 years ago...what evidence would contradict that theory? That would probably imply that the bones weren't processed for meat (or marrow, either), but rather for useful bone fragments. Useful in what way? That's hard for me to say, possibly decoration. I'm not sure how good an arrow head or spear point a piece of bone that old would be, but it could easily be distinctive.