The original source of this material (and the other articles) was John Carmack's .plan file. See https://en.wikipedia.org/wiki/Finger_protocol
The .plan file is by its nature ephemeral, as the user can change it whenever. But the content was archived.
The GitHub is just the latest mirror.
> Will the next historian have to unearth it from github just to copy it to the next platform?
That does seem to be the case here. I had re-hosted these .plan files from a website – which has removed them – that had re-hosted them from Shacknews – which had also removed them.
GitHub seemed like a quirk-and-dirty way to re-host these while giving others an easy way of duplicating the original files so they’re less likely to be lost in the ether.