It’s no different than many public schools requiring teachers to come in during the summer or CNY. There’s nothing for them to do, but they need to be there, and they better be sitting at their desk picking their nose when the county education bureau comes by to make sure they’re sitting at their desk.
The whole online teaching from school thing is BS though. Teachers need to take public transit and come in contact with others to get to work that way!! My principal actually replied to this argument with “well, I drive to work, so I’m not concerned”. Eff you.