Can I open a room after degaussing my ID card?

No, the ID card will be invalid after degaussing.

China's second-generation ID card has two functions: machine-readable and visual. "ID degaussing" should refer to the situation that the personal information in the built-in chip of the second-generation ID card cannot be read by the card reader. The ID card should be handed over to the police station where the household registration is located, and the relevant departments of the public security organs will handle the problem that the second-generation ID card cannot be read by machine and return it to you in time.