Not really, no. It’s proven that people on the internet will yell at you for saying it. People on the internet say it’s possible to do both. But people are incredibly bad at judging their own abilities, see the Dunning-Krueger effect. And people on the internet will say any kind of nonsense, see the flat earthers, NFT bros, and Elon Musk fans among so, so many examples.
Personally, I have yet to meet a single power gamer in real life who’s even halfway decent at RP. Most seem to think that a single line of in-character dialog once every third session is the height of good RP. I had one say that the best role-playing of the night was when they attacked an ooze with an axe. Their definition of good RP was simply not metagaming.
So, no, it’s not in any way disproven. I have yet to meet this particular breed of unicorn in the flesh, but people on the internet keep insisting they exist. So I won’t assume they don’t.