DuPont is a massive American chemical energy company. They have a history of motorsport sponsorship:
http://en.wikipedia.org/wiki/DuPont#NASCAR_sponsorship
But, I say it has to be a joke - using the McLaren photo of the car under the sheet and obviously because it is on April 1st.
Still is interesting because of the Wurz name, but then again it isn't far-fetched at all that someone associated with F1 would make an F1-related prank.
edit: mistake corrected