I wonder, where it was, and how it got on the internet. Normally, if anything like that happens, you wouldn't find a single video on the nets the next day. A 20 men team would normally go for anything political, not a 5 something group along with chengguan. Having a police commissioner (警监) on field duty is also very unusual, let alone 2 of them at a time.
In 2019, unions put a show in downtown Guangzhou, 150-200 people. Wechat feeds, and video sites were lighting up, and next day... nothing, as if it never happened.