> If they're running hardware that old [...] then we can infer that their infrastructure is unmaintained

You lost me there. One thing has nothing to do with the other.

People have reasons for running the hardware they run. Do you know their reasons? If you do, please share. If not, there's no connection whatsoever between old hardware and unmaintained infrastructure.

Is my AlphaServer DS25 unmaintained? It's very old server hardware.

Is my 1981 Chevette unmantained? It's REALLY old. Can you infer that the fact that I have a car from 1981 means it's unmaintained? I'd say that reasonable people can infer that it's definitely maintained, since it would most likely not still be running if it weren't.

> It's not impossible to retrofit such a server with SSDs, but doing that without upgrading to a more recent platform would be a weird choice.

I don't know where you learned about servers, but no, it's not a weird choice to use newer storage in older servers. Not at all. Not even a little bit. Maybe you've worked somewhere that bought Dell servers with storage and trashed the servers when storage needing upgrading, but that's definitely not normal.