/ic/ - Artwork/Critique

Is this guy legit? Had never heard of his material before until I saw him leave a comment on Aaron Blaise's composition video basically trashing him for incorrectly using the golden ratio.
I watch some of his videos and he has a point in that the rule of thirds is a massive oversimplification, but when he starts using this geometry to analyze paintings it just comes off as impractical autism to me. He's also a photographer and not a painter. He seems to have his own made up terminology too; he calls curving lines "arabesques" which in the wikipedia definition are decorative floral patterns and parallell lines "gamut" (??). Anyway, I've gotten really interested in the theory of composition lately and I am kind of open to everything at this point. Thoughts?

Here's the video:
https://www.youtube.com/watch?v=ha3Q1MnCh0Q&t=283s