Not 
% true. Not recommended because of a multitude of issues and they share system RAM [ie, no dedicated GRAM of their own,] … but is supported (as best as can be.)
One of the SketchUp Team members mentioned several people in their office using a Surface Pro.
(Definitely do not buy a used lowest end Surface 3 model with an Atom processor. [See Jody’s comment.] Recommend i5 or better processor.)
I notice that the Surface Book high end models (both i5 and i7) come with Nvidia GeForce dedicated GPU, but the product page does not state which GeForce model. (And IMO they are quite expensive compared to other detachable notebook computers.)