Not sure they have bombs but they are pretty delicate. In reality China has another option. They could just demand semiconductors or else they would close the tap on rare-earth elements [1] and by doing so crashing the economy. Even more so if they annex/invade Vietnam.

Other countries have availability, but only China has the supply chain to extract and process these elements at scale. For any other player to step up production to match current demand it would take years.

[1] https://worldview.stratfor.com/article/geopolitics-rare-eart...