Of course, if this were "true" and "proven", I would imagine it would be all over front-page news for every major publication.
We don't know any of this for sure.
Intelligence and creativity didn’t arise because protohumans became fungal hybrids, but rather the psychedelic mushrooms not only provided sustainance, but also provided behavioral changes like better visual acuity (I believe this claim is proven), sexual arrousal. This mean mushroom eaters were more likely to reproduce. As a sideffect, the psyliopsybin either promoted neural placticity, or novel wirings.
Protohumans that didn’t eat mushrooms died out, and the most successful eaters were the most clever protohumans. (Perhaps behavior became the dominate sexual selection criteria, rather than say meer physical features.)
He says a lot of other weird stuff like, mushrooms are from space, are conscious, or maybe are communication devices, or maybe prerecorded messages from alien “self transforming machine elves”, or maybe they are the elves?
Oh well. All will become clear when universe hits maximum novelty in 2012.