The AirPods Pro can be charged through the charging case, which is because there is a battery inside the charging case that can provide charging for the AirPods Pro. When the AirPods Pro is placed in the charging case, the charging case will be connected to the AirPods Pro through the internal charging port to start charging.
This design makes it easy to charge the AirPods Pro when not in use, ensuring that they always maintain sufficient charge for ready use.
The original and genuine charge is disconnected. It's supposed to be a fake.