When they make references to pop culture icons, who are well known, they USUALLY do it in some spelled out way... Like Harrison Jones, Bronjahm, Harris Pilton and Ricole Nichie, etc, etc.
Then you have blizzard's pop culture references that are actually "vague..." like, REALLY vague. Like the NPC "Shok'sharak" a faceless one in vash'jir, who's name is phonetically the same as former French president, Jacques Chirac. Now, I don't live in france, but I'm going to assume that Jacques Chirac was not a giant amphibious squid monster.
"Iron Man" would fall under the first category. All of the people referenced fit their NPC in some way. Now, sure, maybe they'll load Iron Qon up with Iron Man quotes of some form, but really... from what I can see, they bear almost no resemblance.