[Lambdanaut]

They're referring to the re-invented character from the recent Paramount Pictures films. He was their "model" that inspired the character.

That's what they say, anyways. Elon Musk isn't nearly as socially heroic as Tony Stark, he's a stuttering nerd. Not that that's a bad thing. He's a genius, but they're really nothing alike except for them both being overly ambitious and successful entrepreneurs.