....how would you even know that? (that no "real" architects were actually involved in the design of the software), especially with the conviction you seem to be exhibiting? I probably neglected to read the part wherein you mentioned just how deeply involved, you personally were in ArchiCAD's development process, and as such were privy to all the "consultants" involved and their contribution.
And besides which, who exactly claimed that they "wrote" ArchiCAD? There's a distinctive difference between writing a piece of software (which would imply coding) and DESIGNING the software.
But then again, the whole point is moot, since in your world, or as you seem to be implying, there can't possibly anyone anywhere in this planet who would happen to have both an architectural education or architectural professional knowledge, and also just happen to know a thing or 2 about software coding. I mean, that would be just be simply outrageous. Right? right.
Lastly, why in the world does it even matter whether or not you believe, what you believe about it (..... or want to believe, ......or have chosen to believe....; whatever the case may be). Particularly, since you've already made up your mind about it, (based on nothing more than mere idle conjecture, and no real evidence).
Hint: you can't ask people to disprove to you what you didn't actually prove in the first place (i.e. that ArchiCAD wasn't actually designed by architects). That would be like me asking you to disprove to me, my claim that little invisible green alien gnomes steal people's socks and underpants, when they're not looking - when my only basis for making such a claim in the first place, is that I "believe" it to be so. I think in such a case you would call me crazy; and rightly so.