It because he doesn't know what he is talking about. He is making videos that tell people what they want to hear. His videos never go into any detail, he PHs his water. How? He never details of explains the specification of the lights he uses. He never runs into major problems. He gets minor ones that can be attributed to him, never the product, then fixes them with the products.
His videos are "infomercials", they inform us over and over about the products he is selling and to provide "dank eyecandy" to the idiots that send him money via his Patreon account. "Yes Mister Canuck, I am going to send you money every month so you can sell me over priced nutrients."
In this video he drops the name of at least six different companies and provides affiliate links for all of them. He is high profile and that video alone has 465,000 views, if he gets just a 0.5% views to purchase rate on his links that is 2300 sales a video, plus the people that just give him money on Patreon, plus his channel merch sales and whatever deal he has with Gaia Green.
He is simply a video maker and sales man. He is the Youtube equivalent of that stoned guy in the grow shop that claims to know everything. Watch that video, he ran into the problem of not having an 100% germination. He then suggested that it was because he didn't use fresh medium, but never fear because Gaia Green is here with bags of fresh coco, EWC, Perlite and all purpose 4-4-4 to save the day. This is utter salesmanship and bullshit. Coco is completely inert, if it was wet enough they would have germinated. I germinate in wet paper towels, which is completely inert, yet I get an 100% germination rate.
The guy is a chancer.