Yes, but if the "fake detection" technique is computationally much faster than the generation technique, having access to a better oracle is not so helpful to the deepfake creators, who are bottlenecked by the other phase.
I would interested in a way to automatically edit real photos of people in such a way that it looks the same but now tests positive for being a deepfake.
Tangentially reminds me of the film Surrogates, where people only went out in their surrogate, a remote controlled android - in some cases, a younger, better looking version of people. In other cases something completely different of course.