Yeah, I am a cyclist myself. The bicycle lanes in Tokyo were woefully inadequate, so many cyclists using the pedestrian areas is not really a big surprise. But what was a surprise (mirrored in one of your silbling comments) was the way in which they did it.

I am living in Germany and there are also cyclists on sidewalks here. But I don't think I ever had the feeling when walking here that I needed to move when a cyclist approached. Cyclists are aware they are not supposed to be there so they will have to wait to pass. That was different in Tokyo, hence also my lack of surprise that there needs to be some regulation, since this was clearly dangerous and with a city that size this has to end up in hospitals on a daily basis.