I am the type that doesn't believe anyone's claims unless backed up by extensive peer reviews and other evidence from credible sources, "guru" or not, or unless those claims are validated by my own experience.
I watched his latest video linked on this forum recently, as well as one of his older videos from a few years back. A lot of interesting information, but I left with more questions than answers.
In his last video, he said they used gardinia as an indicator of whether the soil is good for the long term... that if it survives for 3 years, it's good for trees, etc. So, it survived in their Top Soil mix... great. I have fig trees that survived 4 years in my organic potting soil that contains 50% plant-based compost, and they are thriving. I can now claim that my soil is better than his Top Soil mix. Prove me wrong, guru!
He claims that nobody other than him and someone in Texas sells good potting soil... that's a red flag for me. He made a claim that academia is very politicized and that's why they don't want him to teach... that he basically is the only one who really knows what the good soil is. Really? That's another huge red one for me.
They say every potter praises his own pot. That what I see here... He makes soil mixes and makes sales pitches to backyard gardeners. Nothing wrong with that. Is his soil mix the best for trees? Not better than the potting soil that I use, loaded with compost, which he claims would kill a tree after a year, but in which my trees have been thriving for years. I also re-use my potting soil year after year after year to grow tomatoes and other veggies... I don't see plant roots rotting or suffocating. I see no water-logged sludge. I see perfectly aerated soil that my plants love.
In his video, he did, to my surprise, briefly allude to the fact that various microorganisms could make such soil aerated by burrowing through it... but that doesn't make sales...so let's go back to talk about the unmatched superior qualities of Acid Mix and Top Soil