Sure, the view that volition is an illusion is not self-contradictory. And I get that this is a very useful view, because it lets us set aside "conscious inner experiences" and just analyze the mind as a deterministic machine with inputs and outputs. This lets us expect to eventually understand the mind/brain fully using only the physics and computing tools we already have.
Now it leaves conscious experience itself as an unexplained phenomenon, but maybe that will never become important.