Nonsense. You can see the police in the background. They failed to block traffic OR failed to notify a large group of bicyclists, clearly racing, that the road was open. Hard to believe a race with that many riders would be held on an open road.
In genral, I have not run into large groups of bicyclists hogging or blocking the road. Some do ride in groups for safety. I ride, but not in groups. Also many do all they can to NOT ride on busy roads to the point gravel or rising on designated paths is becoming as or more popular than road riding. Some of the issue are the people who have taken it up after covid. Stone called fools. Some of this is no bike lanes or designated riding roads with no bike lanes. At day's end I can't understand someone on a bicycle fucking with someone in a car. That is one reason I ride alone. Those people are, in fact, fucking idiots.