I generally disagree with everything he's saying. Different people play different ways to achieve different means. It's all about what you like and/or what others like. I like acoustic guitar solos that explore all the available notes, be they Paco, Tony Rice, Django, Clapton, McLaughlin, Garcia, Fisk, etc. I've heard loved listening to Lindsey Buckingham and others beat the shit of guitar they were strumming it so hard. There are some pretty damned good recordings with folks using various pups in acoustics and amazing live performances with someone using a mic'd acoustic. A good guitarist doesn't need a capo to avoid playing only bar chords...I'm not in that category, but I play open chord shapes all over the neck. That said, a capo is a great tool for any guitarist.
I get that these are his ideas and practical for him, but they are subjective as all hell. Play an acoustic like an electric, play an electric like an acoustic, play a steel string like a nylon string, play slide on a nylon...whatever the fuck floats your boat and gets sounds that you like. Definitely learn all about nuance and dynamics and incorporate them like mad, but get over any idea of what you should or shouldn't do...unless it's that you present your dogmatic near nonsense off as gospel.
But he's got every right to his perspective.