I think he's taking issue with the claim that Apple "stole" it.
No, I’m not curious to know whether or not Jobs “stole” the invention. I wanted to know whether or not Jobs made any claims in inventing the GUI.
It’s obvious that he “ripped off” technology. Or, if you will, improved or redesigned it. People do this all the time, but to claim that you invented it is truly deceptive and criminal.