AFAIK, the experiments conducted by Libet and other studies like it didn’t show this. What we would need to have seen in the data for this to be true would be multiple occasions where the sub-conscious brain is activated, but no action is performed. Instead what we see is the subconscious brain firing up once before any action is performed, suggesting the former rather than the latter.
Wait, how are you defining free will? If it’s simply the ability to perceive choice and act in a fashion that is aligned with one of those choices, then sure. But that tells us nothing about the agency behind that choice, which is what free will is about.