There is at least 80% chance that author decieves himself too.
See file management and hardware sections and it should be obvious. In hardware section he buys razer keyboard case just to be able to use iPad more comfortably. See pictures there, if we don't know it is iPad it really looks like a proper laptop.
Jumping trough hoops to make something work does not constitute 'iPad Pro is, by far, the best computer I've ever owned'.