[trashtester]

That depends on the relative frequency of the two modes. If 90% of videos of each precidential candidate were a deepfake good enough that you cannot tell if it's real or not, then that is a worse problem than the possibility that one real video can be denied.

In both cases, though, the solution would be to find a way to allow people to tell deepfakes from real videos. For instance by having some sort of certificate provider agencies digitally sign them.

This would still make it hard to tell a deepfake from an unsigned video, of course.