alt Hacker News> is not an insane course of action?
No? Flat out arming proxies is literally the point of overt proxy warfare. Sometimes one tries to to be deniable and source other weapons, but other times it's just, enjoy quagmire, cry about it. It's like suggesting PRC going to start blowing up Lockheed plants if they ever lose anything to US munitions.
Yes, if mainland China is successfully invaded by a country being supplied with American military equipment and having their fixed infrastructure destroyed - like described in the article - you can be dead sure that they will try to destroy American military plants.
None of the super power countries will ever accept defeat in their homeland and being conquered without using all means possible to hinder it. That's why the USA has strong opinions on how the Ukraine uses long range weapons in the war with Russia.