We should be less worried about overt propaganda like DeepFakes and more worried about the assumptions baked into the media of all imperialist nations, the misdirection, and the selection of "what" to report on. States have been lying to us since time immemorial, and they don't need fancy video evidence to do it.

But this is a cool demo, and since the Genie is out of the bottle, this can be a great tool. You could use it to force those who speak in public the most to be accountable for the things that they don't say, or equivocate on, by making videos of them saying it, and forcing them to go on the record denying the video, in contradiction to their established (unspoken) position.