The Vox article is also making a nuanced point -- that memory is constructed subconsciously.

So the insidious thing? Creating 100 videos with only slight political position adjustments, and thereby (even if the videos are later revealed as fakes!) shifting a voter's "gut" impression of a candidate.

I'd be amazed if we don't start seeing audio & video cryptographic authentication in the next 10 years. The subject of an interview gives me a box containing their private key, and video is looped through it and signed as we record.