There were two things that could have prevented that hit. First, the referee standing behind Tua should have been running in, blowing his whistle and waving his hands. Didn't seem like he made much of an effort to signal the false start like he should have in a loud environment. Second, Tua should be taught that if he hears a whistle for a false start to just spike the ball. QBs do this in the NFL all the time to completely avoid taking a hit from a defender who "didn't hear the whistle." If the QB simply spikes the ball then there wouldn't be a hit or if there is a hit it's grounds for a penalty.
I have no idea if Delpit and the other LSU defender heard the whistle or if it was a cheap shot but either of the solutions outlined above could have mitigated taking the hit..