That's not bad at all. I think he's perfectly entitled to give advice to beginners. They don't really need it coming from a GM, for the same reason why primary school students don't need to be taught by academic professors.
Your notion that chess teachers need "decades of experience" or else they are not the "correct authority to instruct us on the best methods to learn chess" is rather silly. How are they supposed to ever obtain this experience then, while they are not yet fit to teach anyone and according to you should shut up? :)
Also, would you recommend against going to a doctor who doesn't yet have "decades of experience"?
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