Pterosaurs are actually one species of dinosaurs.
So if I say that he can draw all dinosaurs that includes pterosaurs.
I thought you should know that, so that the title "Prehistoric Master" would be more fitting.
No, Pterosaurs aren't Dinosaurs. While both are Archosaurs(more specifically, Avemetatarsalians/Ornithodirans,), each are a distinct clades; Dinosauria & Pterosauria. The term Dinosaur does not apply to anything prehistoric, that's why Plesiosaurs, Ichthyosaurs, Mosasaurs, and such aren't Dinosaurs.
So ThePrehistoricMaster is correct in saying that.