Idk why but this crowd doesnt look normal to me or its about their culture to be calm
If you watched the videos of the Masters Tokyo reveal, you can literally hear them yelling.
Currently, there's a limitation on crowd noises per the government in Japan. Although some events are lifting the restrictions slowly, seems RAGE (Japan TO) and Riot isn't taking the risk too much.
The venue in Osaka are a bit smaller as well iirc.