Question about Microsoft Surface 65W power supply unit

According to the manufacturer's reference this article is compatible with the following models: Surface Pro 3/Pro 4/Pro 6/Laptop/Laptop 2/Go/Book. The power does not seem to be high enough for your Surface (this charger here has only 2.58 A)

Here is what the brand says about your model:
Main charger: 15 V at 4 A = 60 W
USB power on the charger: 5 V at 1 A = 5 W

Total of 65 W