I find "logs off" as a euphemism for passed away to be quite poor, even in the context of someone who contributed to to the computer industry writ large.
I had that initial impression initially, but when I die there probably won't be any multiple page article praising me and listing my achievements. This article is praising his life and achievements, and getting annoyed at the wording (especially now that you are the top rated comment on this thread) is a distraction from that. You are now the main character in the story of his death!
That meme emerged nine years ago if we give it the most generous timeline. It's still quite well and alive but I have reservations about how long it will manage to stick around - already we've seen several once beloved memes fall out of fashion.
Yes. A process might be a more ontologically appropriate comparison than a computer user.
"So and so has exited with code 0 and his/her resources have been reclaimed by the system"
A human being is more like an event (a fire, a OS process) than like a persisting object.
Once a process (/fire) has ceased running (/burning), you can start a new process (/fire), but it wouldn't be considered an instance of reviving the old process (/fire), which has ended for good.
Passed on
Expired and gone to meet its maker
Gone off the twig
Kick the bucket
Pushing up daisies
Shuffled off the mortal coil
Run down the curtain
Joined the choir invisible