The JoyPad controller currently supports connection to the Switch 2 exclusively via Bluetooth. Using the adapter also establishes a Bluetooth connection. The adapter's functionality is limited to providing magnetic attachment for handheld mode and charging capabilities; it does not enable a wired connection.
Does it support charging?
Yes, the adapter supports charging for the controller.
Can I use this adapter with controllers from brands other than NYXI?
As long as your controller itself supports Bluetooth connection to the Switch 2, it can be used with this adapter.