Nobody has discredited it. He's on video bragging about it. But the goebbels gang figures they can just keep repeating the words "discredited" and "debunked" as if some team of secret scientists somewhere examined it all and disproved it.
The mockingbirds are rather like ostriches, with their heads in a hole saying "Nope, I'm not looking. If I don't see it then it's not there."
The only thing "discredited" and "debunked" is the facade that we have a free and honest delivery of factual news in the US.
Their pitiful ratings and subscription numbers show that people are simply not buying the "Fake News".