Is this what all the "There is no free will" stuff is about recently? This proves nothing about free will, it just proves that you can deceive someone into believing that they did something voluntarily when they really did it under control. That's hardly novel, that's what happens every time someone walks out of a store with some crap they didn't need and can't give you a clear reason why they bought it. Usually they'll say something like "I just wanted it" but that's not a reason, that's a tautology. Why did they want it?

In other words, this only proves that some externally controlled actions can be perceived as the result of free will decisions. It does not prove that no actions are internally controlled and actually are the result of free will decisions.