For the Associated Press, 2,300 arrests.

The numbers I'm seeing for Hong Kong are in excess of 10,000 in connection with the protests, but those protests lasted for a lot longer (20 months) and were much larger. Millions marched, representing a large portion of the population. The video specifically selected a semi-arbitrary time frame of several months. I guess the idea is to select a slice of the time frame of the Hong Kong protests that produced 2,300 arrests?

The protests in the US just haven't been comparable in size or length. And there is where the comparison is going to be awkward. These sorts of protests have a history of burning themselves out fairly quickly in the US. I remember Occupy Wall Street and its spin offs lasted a few months, made its mark, but kind of fizzled. The BLM/George Floyd protests of 2020 had the same thing happen. Not that Occupy or BLM themselves died, but the clashes that were driving arrests ended. So in the end, I'm not really sure what the comparison with Hong Kong was supposed to show.