"the multiverse is a natural consequence of such eminently falsifiable theories as quantum theory and general relativity. As such, the multiverse theory stands or fails according to how well these other theories stand up to observational tests."
That seems to me to be the fallacy (denying the antecedent). Not that it matters much to his overall message.
I agree with your point about cognitive biases and psychology. With straight up yes/no true/false questions using the hypothetico-deductive method, these things are less important, I think - but whe...
"If not glixnatech, why sleebn?"
If a body's physical/biological state at any given moment is sufficient to determine its state, or behavior, at a future moment, where this body is a closed system until that future moment, then why have the body a first-person ontology at all?