one of the nice things about computer music is the way in which it can be a collaboration between musician and engineer, so much so that the lines are frequently blurred. i certainly got the impression from the article that in this case, Moorer was himself involved in the development of the synthesis package and even the signal processor itself.

Fundamentally though, you are of course correct. This was a mainframe in the 80s, so presumably there was an operating system and system libraries and they all played a part, so should we credit those developers as well? it's tortoises all the way down.