No, you haven’t. You’ve quoted a series of people with no connection to each other who are saying generally unrelated things about demographic change. Some of them admit they’re benefiting from it electorally, but that doesn’t mean they’re behind it.
This is another quote that doesn’t say what you’d like. Nobody in the thread has taken “white genocide” for granted, and formulaone dodged this repeatedly. And nobody in this thread said “groups come, groups go.” The quote is from the Pit thread, and taken in full, it says this:
So you couldn’t have possibly gotten this quote more wrong. Der Trihs didn’t agree that any genocide is happening or that white people are disappearing. He did say in general that groups come and go, which is kind of hard to argue.
He didn’t say anything about the future of white people either.