I love the titles of the journal articles that are reporting on this story, as if this fundamentally changes our understanding of history.
I mean, yea it is a pretty big story if true, but indigenous and pre-historic history is just about the most ignored part of our past. As soon as the hoopla dies down, or if it's ever proven beyond a shadow of a doubt, a few paragraphs in some text-books will be updated, and no one will be the wiser.
If the tools were that old and belonged to homo erectus, that would require a basic rethinking of the prevailing notion about the migration out of Africa 50-60,000 years ago being responsible for populating the rest of the planet. OTOH, if the tools are that old, then they more likely belong to a pre-homo erectus species that are already known to have made it at least to Siberia. Showing Neanderthals made it across the Bering Straight and down to modern San Diego would be a big deal, but it wouldn't really do much to change our own human history.
Regardless, the age of the tools is based on highly speculative inferences.