Well, he did create (at least) two video games that were well received -- in fact, I remember that "Balance of Power" got amazing reviews when it came out.
So not entirely barren in production.
I'm guessing that he's unhappy that people, when taught his ideas, don't follow them closely enough?
I think you are right on this mainly being about his super valuable teachings not being utilized and this specific post not being about the author thinking he's a genius although he does think so[0].
From the initial game setup (options) screen:
> People who play this game without reading the manual are wasting their time.
Cannot judge by this emulator but I agree... started playing and had no clue how to "do" things. But then I read on Wikipedia[1]...
> It was praised for its inventive non-action gameplay that was nevertheless exciting and distinct. It has been named by Computer Gaming World as one of the most innovative computer games of all time.
Apparently at some point events will start to take place, and then you'll get a chance to choose how you react.
[0] https://classicreload.com/balance-of-power.html
[1] https://en.wikipedia.org/wiki/Balance_of_Power_(video_game)