That may be true, but a couple of thoughts:
AFAIK: We don't know if they violated the plea deal; there is no due process; we only have the claims of an administration that is widely believed to lie. We can't distinguish a political decision from a legal one. (Please correct me if I'm wrong about the process.)
And it doesn't matter what the facts are, it's perception that counts. The appearance is that the current U.S. administration disregards process, fairness, honesty, and the rule of law; is an unreliable international partner; and particularly targets China. The ZTE penalty will be perceived in that context. Any leader must account for perception, whether they like it or not; I think we can fairly assume that the administration is aware of the essential nature of perception, is aware of the perception of this action, and has chosen it.