I'm a LHE coach for sure, however the numbers up there weren't biased at all I think. If I'd say yeah, LHE is great game, and you can win a ton of money, you could say that I'm biased, but presenting actual numbers and values cannot represent any kind of bias. (Also, if you don't believe my numbers, look it up yourself, so you'd have your own view of the situation.)
Your perception of the Gib office is quite different from mine. Not in LHE, but overall I think more of the result-players are involved than the actual theorists (just look at the way they present new coaches to us - picture + graph + results). In LHE thankfully it's a bit different, given Boomer excels in every departement I think, and he released the most amount of vids lately.
I don't know what good players you've talked with, but the fact that they don't watch these vids is because they're not the target audience. However if they miss the game theory vids of Boomer, then it's their loss (given they're probably the best ones about the subject I've seen online, and I think I've seen 90%+ of LHE videos out there).
I myself don't process that many vids at all, however I still watch them just to see where education stands at the moment.
Why do you think I'll stop making vids when I reach T/TT? Well, it may be a bit different in English or German, but for my community (Hungarian) I produce videos from the smallest stakes, and I'm not planning to stop when I move up another limit. I just can see no reason stopping. And I don't really give free coachings to anyone right now, so that will obviously be true.:)
Also, let's make a big distinction. Players have skill edges. Some players think it's hard to get to a level to beat 5/T LHE. Personally, I find that 5/T (and higher) regulars make some big mistakes in general. That includes me per se, but I still think you can have a solid edge over regs there too, if you work hard on your game. You'll not win money off of them (post-rake LDO), but you will make them pay your rake basically, that is a huge win for you in the long run. Now for some (or a lot) finding these edges are hard or not worthwhile, so they move onto PLO or other games, or just quit poker. That doesn't mean the games are unbeatable.
The best GTO-thinker of his time was Hawrilenko for sure. However I believe games have evolved to the state now, where he might not be the best today (look at KPR or Newall for example). I won't make a stand for or against PS LHE coaches, especially because that wasn't the main question. However once again, the best videos on GTO/balanced play are on PS for sure.
Also, theorist doesn't necessarily equal GTO-thinkers. Just look at Bunny, who was probably the most exploitative guy I've ever seen making vids, and he himself is a great theorist obviously.
And if we're talking about beginners, I truly believe (biassed or not) that learning FL as your first game is much more useful, than NL. I know, I started of with NL, but understood the main concepts in poker through FL, since it's a purer, game theoretically easier game than NL.
So once again, I think there is good money to be made in LHE, definitely not as much as could be made in PLO, however I think for some goals (e.g. learning for beginners) LHE is far the best option, and it doesn't fall behind in any departements (profitability for example). (Also it's pretty obvious you yourself don't make arguments, just counter-arguments, so I'd like to hear why do you think NL is way better choice for beginners.)