Hmmm. Actually I think I finally figured out why I dislike this argument, so thank you.
The important number here isn't the total years something has been true, when talking about something with sociocultural momentum, like the expectation that a recording/video is truthful.
Instead, the important number seems to me to be the total number of lived human years where the thing has been true. In the case of reliable recordings, the last hundred years with billions of humans has a lot more cultural weight than the thousands of preceding years by virtue of there having been far more human years lived with than without the expectation.
That's a false metric. With exponential progress, we have to adjust equally rapidly. It's quite obvious that photos and videos would last far shorter than written medium as proof of something.
The important number here isn't the total years something has been true, when talking about something with sociocultural momentum, like the expectation that a recording/video is truthful.
Instead, the important number seems to me to be the total number of lived human years where the thing has been true. In the case of reliable recordings, the last hundred years with billions of humans has a lot more cultural weight than the thousands of preceding years by virtue of there having been far more human years lived with than without the expectation.