My take on Joe Marino, and he can correct me if I'm wrong, is that he was he never a "sciency"
guy it was all old-school bodybuilding wisdom. He is a bodybuilder through and through, he's no
science nerd, not a guy who ever read any kind of challenging books, training or otherwise. Now, he decided to become a recognized trainer so he needed to align himself with the top trainers in the industry. All these guys are big on science so he needs some of that angle as well. So he says V.M. Zatsiorsky's Science and Practice of Strength Training, A System of Multi-Year Training in Weightlifting by A.S. Medvedyev and Supertraining by Yuri Verkhoshansky are a great books (since guys like Louie Simmons etc say so)(LOL, look up these titles on the net, did Joe really read and digest these tomes?).
But Joe really doesn't give a fuck about science, you can see it in any topic he discusses here, whether religion, climate change or whatever.
So he's in a weird place. He will cherry pick scientific data when it suits him. I'd still like to hear how painkillers break down the CNS which he talked about earlier.
Oftentimes his convictions clash with the science and the opinion of guys he admires as trainers. Like with the insulin topic. Joe believes a modest shot of insulin will fuck up your "metabolic pathways"... he uses a scientific term but can't support the statement with science. Meadows is another guy who believes in ramping up insulin (though he claims he never uses insulin, but drinking a couple of hundred grams of carbs during training will jack up insulin into the stratosphere).
I think Meadows is bit on the pseudoscientific side of things with the grass-fed, organic stuff he preaches.
Personally I was always a big fan of Lyle McDonald, now here's a guy who can explain science to a non-academic such as myself. This guy has a very harsh style, he suffers no fools, completely uncompromising style. He is rarely wrong so he gets away with being being a complete asshole.