The first Swift deepfakes I heard (currently the only ones) are the mathematical proofs (like this one on YouTube).
Hopefully, enough Swifties encounter them and are able to learn not just some sweet math, but that we have tech good enough to render anyone saying anything. Also that Deepfake Taylor has pretty solid math chops.
Then we get back to square one, where the authority or celebrity of a person is not enough to take their position as truth, but we also have to consider the merits of what argument they make.
For now, though, the Taylor Swift math proofs might serve to defuse Taylor Swift PSAs that might lead people astray.
ETA: Einstein adds a PSA to the end of this proof advising that yeah, we can't rely on who is saying something as informing its veracity. (Fixed!)