I don't think it's clear that it was an analogy at all. It sounded like a forecast of the collapse of civilization. Even if the claim is narrower, what you're saying is a prediction that can be tested against reality. It doesn't seem likely that a project like Linux, with strong leadership and expert eyes on every change, will fail because of a few AI commits. I suspect reality is a lot less catastrophic and a lot more mundane, and we see a small productivity increase while the project continues more or less as usual.

If the United States or the Linux kernel project or frankly any other institution lasts as long as the Roman civilization, that would be a rare achievement indeed! In my opinion, its longevity is the single most striking fact about Rome.

In comparison the US is a baby, and the Linux kernel barely an embryo.

Depending on how you count, Rome lasted 1229 years (from founding to fall of the western empire) or 2206 years (from founding to the fall of the Byzantine empire, which was the eastern part).

Twelve hundred years! Two thousand years! I hope we dig our graves as slowly as the Romans did.

Roman empire was a state, not a civilization. Roman civilization very much exists to this day throughout the western world.