This was a Critical Mass event, which is why the bicyclists are taking up all of the street as a way to reclaim the streets and protest the lack of safety for riders under usual conditions. It’s not legal, but protests are never useful if they’re fully legal now, are they.
Nobody thinks this proves anything. If you think that is what is happening, tend to your own brain rot.
This is evidence supporting an argument, not evidence proving an argument. Feel free to provide contrary evidence.