to me this sounds an awful lot like: "Sure, many-worlds is the simplest explanation that fits the facts, but I don't like the people who believe it."

Then, sorry to put it this way, but you have a hearing problem! :-) All he said was "many worlds could be true". Not "I would believe it if only I could let myself do so". He's agnostic about the truth; he considers many worlds a possibility; and he's put off by people who consider it a certainty.