This is an online lecture, and no screen recording is allowed, so I cannot give evidence accordingly. This online campaign is from Apple Developer Relations - Apple China Design Development Accelerator.

This is not a good way to solve the problem. Modifying this will cause the volume of the app to be affected by the mute button.

I got confirmation from apple developer accelerator. When the Background Modes are Audio, AirPlay, and Picture in Picture, it is not possible to update the Live Acitvity.