This guy is annoying. He's not a scientist and is using stuff like "joy" as a semantic stop-sign
. Scientists need to understand WHY birds enjoy songs rather than saying "Because the songs are enjoyable". That is the problem with anthropomorphism. And yes I will side with the behaviorist caricature and say scientists should not "anthropomorphize humans".
I haven't finished listening to the whole interview, but has he mentioned the prevalence of diahrrea among peacocks? That's relevant when it comes to having a large (but clean) tail.
Regarding Neanderthals not having music: that's an older idea, less common now that we have their genome and detected FOXP2
Many humans are not creative. They are still human.
The fact that signals can be dishonest is a pretty important part of adaptationist theory. A common phrase is "mimicry", and of course there is an arms-race involved in cycles of deception and detection. And one of Cosmides & Tooby's most famous studies is on how we are more perceptive when trying to detect deceptive rule violation than solving some Bayesian puzzle without that element.