Ramon Amira wrote:The main question that struck me after watching the video was is there anything in it to justify the grandiose title that suggests there is something revolutionary about what is he saying
Perhaps your puzzlement is a case of enlightenment looking obvious to the enlightened? My second impression was that he meant "...changed MY classical guitar approach" and something got lost in translation. But actually, having looked at other videos and his website, I think what he really means is the other way around--more along the lines of "How my approach reveals easier ways to finger pieces that many consider 'difficult'".
This video I think gives a few more clues to what he's about (and has the far humbler title: "apoyando vs tirando in J. S. Bach"):
I find two highly commendable things about what I understand to be his approach: 1) he's searching for first principles, and 2) the bedrock principle is that the purpose of technique is to serve the musical idea. He's certainly not the first to take a stab at illuminating this path, and I hope he's not the last. Whether it's revolutionary or even interesting I suppose depends on where you are on your own quest, but I think at worst he offers a good role model for a valid way to comprehend and navigate a path to mastery.
What puzzles me is that the book he seems to be talking about doesn't exist at his web shop. Or is this another translation issue and is he actually referring to the totality of his publications?