The Shivan one sounds a bit like the descriptions of the attack on Tombaugh, where the Shivans were to have jumped out of the Lucifer and attacked the Terrans in the same way..... it's an interesting animation, maybe at one point they were going to do a Vasudan perspective campaign for the expansion, or maybe this was how they were intending on introducing the Lucifer (Shivans got to come from somewhere, right?)
Incidentally, that Typhon is much more detailed than the game model. Lots of ridges and bumps on the top-back, and not-entirely clear but visible detailing on the front and sides, too.
TVfite... I guess they got the idea from the barfight cut from FS1. Maybe someone pointed out that a Vasudan is a wee bit bigger than a human is......