I am unclear what the joke is here. GP appeared to be sincere because there is a still image from the film embedded in the FAQ for no reason.
The “joke” is not part of the FAQ. So, what actually is the joke? Has the joke been made in public forums before today? We're unable to find prior art concerning this joke or meme. Does "plan9 humor" consist mostly of making shit up?
the joke is that plan 9’s not UNIX, and thus does not run Jurassic Park. the absurdity arises from the fact that using such a capable operating system for dinosaur husbandry (im told this is what jurassic park is about) would be, frankly, philistine in nature.
If you look at the image from the film you will note it has the cat(?) clock of plan 9 fame. So its fairly obvious that the image is doctored.