It may be a boon to EV makers everywhere including in China, but I don't think it's a boon to China generally as they buy a lot of their oil from the Gulf states. Thus they're more directly affected by the Hormuz shutdown than the US (which is a net oil exporter and is mostly only affected indirectly by price increases).

Like the Ukraine war, maybe one good thing thing we can say about this terrible situation is that it may encourage a lot of countries to move to renewables (or nuclear) sooner than they otherwise would and cut back on fossil fuels.

The energy crises of the 1970s caused people to start caring a lot more about fuel economy. Now we have the technology for people not to need to buy gas to propel their vehicle at all, and many of them once they switch they're never switching back.