You've misunderstood. It's hard to prove a negative, which is the point. But made-up things are lies - evidence is the only currency of the realm.
In any case, clearly the prevailing understanding is wrong in one way or another, and that should be reflected in curriculums alongside this new evidence.
But it really wouldn’t surprise me. As others pointed out, the Inuit traveled across the Bering Strait into what is now Russia many times pre-Columbus, so the idea they may have brought beads back with them is plausible.