I wish “your data fits in memory”[0] was still up.
Sadly, it just used 6TB as a fixed cutoff, so keeping it up-to-date would be a manual task.
Today, only a few years later, that number is 24TB. (Even more sadly, that's for the last generation of Intel CPU, whereas the current 8S generation tops out at 12TB and isn't even scheduled to have models that would get to 24TB until next year).
Maybe their data was in memory, and the machine powered off.