ya know what's ironic? That's not even an insult. This kind of remark would make a non-narcissistic investor backtrack and say, "well, yes, you're right, I didn't technically invent this" then go on boasting about how he financed much of the modern-day development for these technologies. I'm sure that would render good PR in the end.
But Musk doesn't know that, because he's not a mentally healthy individual. None of these people you're mentioning in this article are. They choose denial instead of reality every single time. You're spot on. It's intellectual narcissism.