They say in the advertisement that Duke Nukem Forever came "out now". In which year does Stronghold take place? On Wikipedia it
said that Duke Nukem Forever's release date is expected in 2011!
I think it's still intended to be a poke-n-prod at it.
Duke Nukem Forever sounds like a vaporware project - even though it probably isn't, all the hype that it's gotten with just enough substance to keep people attached to it makes it seem like one.
DNF will come out in 2011, Gearbox is now in charge (and has all the rights) and it was playable on PAX.
Ontopic:
Yes those Ads were awesome, funny and very hilarious.
I walked by and stood there for minutes just to see some new ones.
I smiled and laughed, that was really great.