Not sure if anyone else knows who Kalvin is. Found out about him through 17 year old DD. He's an 18 year old transman who makes YouTube videos mostly reacting to "transtrenders" and "SJWs". He refers to himself as a transsexual and uses the term "transmed" (i.e believing dysphoria is required to be trans).
He's repeatedly been verbally abused / piled on for his opinions, both on Twitter and in YouTube comments (and in videos people have made about him).
He acknowledges ROGD, though not exactly the same way as GC feminists do. He is very outspoken about the fact that dysphoria is a mental illness / medical condition and should be treated as such.
Similar YouTubers include Storm Ryan, Sam Collins, Miss London and Blaire White - all have an audience comprised of mostly young people who share their viewpoints.
Although they don't share all of the same opinions as GC feminists, I think that maybe it's a good thing that teenagers are exposed to more of this content - it shows not all trans people agree with the current narrative.
I'm pretty GC, whereas DD is more aligned with the viewpoints of those like Kalvin - which is okay by me, far better than other things she could have been swallowed up by. She's as GNC as they come and I'm quite glad she found these people rather than the likes of Ash Hardell, Chase Ross etc.
I've linked some of Kalvin's videos if anyone wants to take a look. There's a bit of swearing in them and general teenage behaviour but he seems articulate and self-aware. I don't agree with everything he says but it's always interesting to see another perspective.