The "nVidia are selling chips to China" thing wasn't exactly a secret though. It was all over Twitter and the tech/investment communities I was in. And in the gamer communities (as we're pissed at how nVidia and the rest of tech have screwed us).
Lots of things exist as open secrets, but once they become official news reports with lots of coverage the need to address the issue increases.
It's not just that they were selling through China, but that they bribed their way through the Trump admin's efforts to investigate it. But even that was partly known, it's just everything is now coming up all at once, making it so obvious he had to take a fall.
The emporer was naked the whole time. Someone finally pointed it out. This is the fallout.
Not particularly new situation in the recent US times. Far from the last time this will happen.
What you know and what you can prove are not the same.
What we can prove in the near future likely changed a bit when Congress went to the Dems a few days ago. Republicans weren't gonna make a scene about their $25M donation to the ballroom project.