I believe he was just saying that Stiffler'd make a less effective Villian than Palpatine, which is true.
And that the Russians, instead of being portrayed in any particularly effective threatening way come off as relatively harmless dicks (like stiffler) when compared with the forces of evil in the previous films (Almost a Palps levels of evil), but thats all I got from that...
I dont think humour was the guys point.
Man your Emporer's Mum vision is the most twisted image you've ever created in my mind...!!!! 😘
*Goes to throw up into some lettuce* 😛