I don't understand why that YouTube video requires age verification. As far as I know that prevents it from being played to anyone not logged in, including embeds, and severely limits people from seeing it.
Social media flagging is censorship. More and more people are calling on videos to be flagged, taken down, etc — then we run into instances like this one where we wish the mechanism wasn't in place at all.
I hope HK brings to world back to a recognition of the important of free speech and that the world brings attention back to HK.