China's not negotiating. This is the best result for China. As long as USA is going to continually be belligerent with tariffs to all nations, China actually would not benefit with preferential treatment.
China wants to let the tariffs slowly but persistently eat away at USA's economy. 30% is just about right as Mexico and Canada are at 25%. China doesn't need to be the cheapest, just affordable enough that Americans will still buy. So while trade will decrease it won't stop. This gives China the breathing room they need to build up supply chains everywhere else. All the while Americans will afford less and less as tariffs eat away at their income. This will lead to less business creation activity and destroy manufacturing as the manufacturing inputs being tariffed makes USA products unaffordable.
If this looks like China is capitulating, all the better. Though most people realize it's Trump that blinked. Since their counter actions aren't really tariffs to begin with. China can order their companies who they buy from and more importantly who they don't.
Oh it's totally going to get far fucking worse. I'm just pointing out the problems are already here. Fingers crossed we don't nuke ourselves to cavemen times. Or maybe we'll get to live the fall out games. Better than caveman times so we got that going for us.