To ask if the money changed him is to ignore all the other potential causes of change.
Maybe it's the amount of work (if it's taking a toll on the lower level employees...he's been doing it longer, and probably more), maybe it's the lack of time for personal development, maybe it's the accumulation of reading comments and developing an...inverted parasocial abusive relationship with "the community" where his skin needs to be both super thick, because there's an endless firehose of hate, but also be responsive to feedback. Maybe it's years of having people talk about how great he is and defend him even when he's in the wrong. What do all those mean for someone's ego? And if someone has sacrificed quite a lot of the rest of their life to be successful in business (which he's fairly plain about), then won't their ego lean into financial success? All of these are plausible, and maybe none of them are right.
Did the money change him? Probably. It usually does. But I couldn't claim to know, and it doesn't really matter if the money changed him, or something else changed him, or he was always this way and his environment changed. What matters is the position he's in now, and where to go from there. If his content is too much about money stuff, I fairly trust that he'll be able to read that room. Surely if he has professional competence at anything, putting out content that performs is it. But the ego stuff? Where he's clearly (from outward communication alone) taking things as personal attacks and responding emotionally in ways that hurt him, the company, its employees, and the community. I don't think anyone wants that.
This whole machine is built on his name, his face, his personality. Unless there's a potentially business-ending sea change away from that fact, he needs to change to avoid these situations in the future. And he should probably change anyway, just because...I mean, I'd want to, in that situation. Wouldn't you? Does it seem like a fun emotional experience to feel attacked, feel like you need to do anything you can to defend against it, no matter how ill advised, and then have to eat crow because of the results? It could be therapy, it could be from dedicating time to directly fostering healthy relationships where he can talk about this stuff with more people, more broadly, it could be from literally just taking more time to gain perspective on everything, and that "his life's work" isn't just "work". Probably all of the above, but whatever the right answer is, I'm sure I don't know the specifics because I don't know the man.
Most of us don't have the luxury of doing what is required to meaningfully work on ourselves. Having a boatload of cash can remove a lot of the barriers that stand in the way of that. I don't know if the money changed him, but I hope he uses it in ways that do.