What i understand from his sentence is that in the game it should have been Silkworm IV, but they could not use it so they had to think of an alternative way of writing it.
They came up with the SWIV then they had to invent an acronym it adapted to, so they came up with Special Weapons Interdiction Vehicles
(that is camp #3) and put that in game while everybody in the development team knew the correct sentence should have been Silkworm IV
That's what i understood from the page, but who kows ... :laugh .
PS - While i was searching for swiv i found an interesting variation in a cheats site : SWIV Sandworm 4 :laugh :laugh
(makes you think it is a sequel to Dune 2