We always suspected. And some people just "knew"…
The US government covertly supported the 2019 Homg Kong "pro-democracy" demonstrations, even as they devolved into widespread rioting and vandalism.
Now we have the proof by of admission to the fact, as reported by Alex Lo.
By the way, the "pro-democracy" name? Better be more accurate. They were "anti-China" and "anti-government" more than pro-democracy.
Remember that universal suffrage was an afterthought. It wasn't part of the original "Five Demands", which included instead a demand that C-E Carrie Lam resign. When that appeared either unlikely or meaningless, they dropped it and added the universal suffrage demand, as the last item on the list.