Also I doubt if it is a case where researchers just perform the main rituals and others do all the remaining work.
If that is true, then your researchers are effectively managers here. The real workers are lab techs, programmers etc.
If we have to do this, lets put the saddle on the right horse.
That's often how it works these days. Means the university can keep most of the workers on lower pay scales and avoid having to grant them tenure.
Well yeah. Professors are like business unit leaders/managers, acquiring funding for research and setting the main outline of what to do. Then the others (usually, although not always, designated 'administrative staff', or grad students/post docs) execute the work. I'm not sure I would call them 'real workers', that implies that others (i.e., managers) don't do 'real work'. I mean I understand what you say - you mean 'real work' as 'producing something', but 'creating the circumstances in which others can produce something' is also work.
The thing is its always easy to see who 'produces something'. When you start talking about 'creating the circumstances', you trigger of a chain of helpers, who help helpers, who ... and so on. Until you arrive at a point where there is a whole hierarchy of people sitting just to approve things, keep records and pass memos.
Most universities only distinguish between "academic" positions and "staff" positions.
At most universities, "Academic" positions are something rather specific: usually only the faculty proper, Ph.D.-holding researchers, and maybe a few other student-facing roles (e.g., librarians).
Here is my quick two-part litmus test that's probably pretty accurate for most universities. Assuming you don't know for certain that you are in the "academic" or "staff" bucket, consider these two questions:
0. Are you a Ph.D. student with some funny title like "research assistant"? You are a student. You are not "staff". You are not "academic". You are a student.
1. Do you hold a Ph.D. AND listed as a co-PI on grants? If yes, you're most likely in an "academic" role. If not, you're most likely in a "staff" role (unless you're working with someone who has a shitload of clout).
What happens often in reporting is that "academic" and "staff" numbers are reported, and we assume "staff = administrative".
See the Stanford numbers, for example. Notice how there's no category for "non-administrative non-academic staff". You're either a member of the "academic" group or you're an "other", and the "other" group is not broken out into "administrative" and "not administrative".
Hopefully, this helps. It's all rather confusing and political and, in many cases, institution-specific :)