There was a Dr. of physics (or math or something) that joined the two devs some time after the game was already being delayed. Quite a while after the WSC split.
What would that guy benefit from taking part in development of vaporware, and what would the brothers gain from anouncing it, if it was a lie?
The most likely case is still that they are simply taking no chances, the same way Scavier and DNF's devs are, to release what they've promised.
You can't deny a sim encompassing all they've promised would be done quick.. It's probably at least as much as LFS will take in total, and we know how long that is.