I've been trying to figure this out. A couple of things. Were they officially coaches for USC? If it wasn't official yet then they would not be permitted to recruit on their behalf.
Here's another one, with those kids already enrolled at UT (with classes starting today) was this tampering? If a recruit has signed a LOI another team can't continue to recruit them. I don't know the rule for sure on early enrollees. At what point are they 'off limits'.
At the very least it was slimy, but I'm wondering if anything serious could come of it.