The Nintendo Switch AC Adapter uses USB Power Delivery technology to provide rapid charging for the Nintendo Switch over the USB Type-C interface. The Huawei MateBook also supports fast charging over USB Type-C with its own USB Power Delivery based charger so let's see how well the tablet performs when connected to the Nintendo Switch AC Adapter.
The Nintendo Switch AC Adapter can be seen to offer USB Power Delivery profiles of 7.5 watts (5 volts @ 1.5 amps) and 39 watts (15 volts @ 2.6 amps) to the Huawei MateBook which then requests to pull 15 watts (15 volts @ 1 amps) which is accepted by the charger.
After a while the Huawei MateBook follows up to request 39 watts (15 volts @ 2.6 amps) which the charger complies.
With the Huawei MateBook's battery being already well charged, the tablet is observed to be pulling about 15 volts @ 1.5 amps.
We can confirm that the Huawei MateBook can work well with the Nintendo Switch AC Adapter to charge using USB Power Delivery.