China doesn't need that technology very badly, if they can just stay making CPUs they'll be able to figure a GPU architecture eventually. Don't forget that Chinese Kirin CPUs have and will outcompete Qualcomm and Samsung.
What I’m talking about is the capability of instantly kneecapping the US tech industry. A sudden differential advantage created by denying capabilities to your adversary. That’s what makes the current semiconductor situation a geopolitical tinder box.