"Visor" has a standalone meaning as a movable part of a helmet, which can be pulled down to cover the face.
The word "supervisor" has spawned the (to me, slightly distasteful, even though I once played drums on a song with it in the lyrics) "hypervisor" (which is like a higher-level supervisor of an operating system), which suggests that "visor" is a suffix. https://en.wikipedia.org/wiki/Hypervisor
But a suffix of what? A supervisor doesn't do anything with "supers" and a hypervisor doesn't do anything with "hypers". So, as a suffix it doesn't really work, as it doesn't really have anything to do with the thing that it comes after. So, I wouldn't say that it's attained full suffix status yet.
Having said that, I suspect that if you showed the word "computersystemvisor" to a group of people, a lot of them would guess that it means "computer system supervisor", and that it's more of a contraction than anything else. I don't think many people would interpret it as meaning anything else, anyway: they'd either get it or just not know what you mean at all.