[energy123]

Israel was losing the Yom Kippur war until Kissinger's resupply effort. They didn't use nukes. Probably because Egypt signalled they were going for limited objectives. Israel's home front was also attacked unprovoked with Scud missiles by Saddam as a desperation measure during the Gulf War. No nuke usage.

Any US attack on China's industrial base would have similar signalling to control escalation risk. It would probably be limited to key nodes in the missile or drone supply chain rather than attacking the entire base. China likely wouldn't use nukes because they are also worried about the same escalation risks as the US. They will know the US is pursuing limited objectives. The US will probably tell them this through a deconfliction line, as well as publicly. If China does use nukes, it'll likely be limited with the goal of escalating to deescalate.

None of these decisions are easy and I agree there are significant risks. But I wouldn't rule it out, especially if the alternative is to lose a war of attrition and have your influence rolled back.