Naah, that was never a thing. EG: In 1917, two young girls created some photographs of fairies, the Cottingley Fairies. Arthur Conan Doyle, the inventor of Sherlock Holmes, endorsed them as real. When you have eliminated the impossible, whatever remains, however improbable, must be the truth. That quote is terrible advice.

The last 1 or 2 decades were really the golden age of credible evidence. Everyone has a video camera and can upload these videos almost immediately (proving that the videos were not edited later). Yet, at the same time, misinformation has become this huge topic.

We're not back to square 1, either. You can still immediately upload a video (or a hash, or get it certified in some way). Say, you do this with dashcam footage after a collision, ASAP. That makes it almost unassailable as evidence, because you can't have had time to forge it; certainly not in a way that is congruent with independent evidence and testimony.

If several people, upload videos of the same event at about the same time, then they either are all in it together and carefully prepared the videos beforehand, or not.