To answer more in details some of your questions not covered by @Mindbullets
CyberGene I opened his YouTube and it seems he's mainly a classical musician.
I think it's fair to say that he is, however he considers himself more of a pop one, of that very-light-jazz style that's really pop-rather-than-jazz which might have been why you considered him so.
CyberGene Is he well accepted in the teachers community?
He had a traditional musical education which he hated, so he pretended to do what he was taught whereas he did not (for example: practicing scales) instead "inventing" his own way to do things which is what he teaches. That was very successful for him (he won piano competitions, played in concerts with orchestras and be paid for it, etc). He was hired to teach in a conservatory for a while, but quit because he could not stand by how music is taught and made (think beat machines, quantization, note editing even in classical recordings and that sort of stuff -- on that I have to say that I strongly agree with him). He considers himself an outsider, a maverick. Given what I know about the teacher "community" (or lack thereof) I would say that what he teaches would not be accepted if he insisted in presenting it with the "dissident" approach he does. But if one looks at the substance (rather than the form) of what he does teach, I can easily see that what he teaches is not far from a traditional "school of thought" that music message comes before everything (e.g. before technique) and one should be able to do that first. I had two teachers who tried that approach with me before Phil, so I see that similarity. The difference is that Phil is very deliberate and his "musical message first" is very clear and his maverick-presentation is really helpful from a student point of view. The other two teachers of "musical message first" approach that I had could demonstrate musicality by their playing, but could not explain where that musicality came from, let alone teach a student like myself to develop it! The most they could teach was mocking what they were doing, or teaching hope that "fake it till you make it" was a viable strategy. Quite the opposite of Phil who (in a nutshell) says that "music message first" comes from intention, focus on the rhythmic structure (check his many public videos about that) and a naughty "I don't care how it goes" attitude. I mean, there's more, but in a nutshell that's it, and for me it's extremely effective. I hope to be able to demonstrate a "before and after", by relearning a few pieces of those I recorded earlier to show the difference, but I'm not there yet. Even if for some reasons I will be unable to do so, I'm happy because learning to play the piano with him is expressive and exhilarating, whereas before learning anything was "blood and sweat" and I kept doing it only because I was (hopelessly) hoping to achieve an objective that never came.
CyberGene Does he have any famous students and success stories?
Not famous ones AFAIK but he has success stories like the one above. As they say, I'm not authorized to speak about others.
CyberGene because his main YouTube page is a bit pretentious and more influencer-like rather than neutral and humble which is what I usually expect from teachers.
He has definitely a strong personality and he does try to "get through" in YT. I don't like the latter, but I don't hold that against him. I don't care about personality: everyone's got their own, and we just have to learn to live with the people we care about. I can see how some people may find him "not someone they want to deal with", and I think that's totally fine.
For the rest, I agree with what @Mindbullets wrote
PS: should we split this discussion in a different thread? I know it has been sparkled by the keyboard layout, but we drifted far from it