"If this is true, EVERY theory of human evolution is out the window."
That doesn't follow, not at all. The only consequence of this finding (which is only the first of many) is that the isolationist political nonsense that has been infecting the study of PreColumbian humans in the Americas just got a tooth knocked out and a cut over the eye.
Tools are found all over the world. Erectus (or someone) left tools on an island (and it has been an island for millions of years, even during the large-scale glaciations) 800,000 years ago.
I was thrown off a bit by the claim that "Humans" (to me, Homo Sapiens - not all Homos) made tools in CA 200,000 years ago. If we open this up to add all Homos as Human, then everything you posted is correct.
Interesting.