Is that too difficult for you to comprehend?
So. He also signed a bill that can be contested before it goes into effect. As president he can see to it that he insures the bill gets to SC as early as possible, he can insure that the arguments for the bill are as weak as possible and finally he has the authority if all else fails to not enforce it and provide pardons in advance. Unlike those who are in hysterics I can see that a veto is not the only method at his disposal to support free speech.