Unless China sold it to Pakistan before the current events. It wouldn’t be a good idea to do such a thing if the situation deteriorates badly. There are significant risks associated with it. If it goes nuclear, then India may be more inclined to launch some nuclear warheads at China over direct involvement. You can guarantee the Americans will be pushing the Indians or Pakistanis into such a scenario. It might solve their China problem after all.
I disagree, because china can also take out India in a nuclear exchange. India leadership isn't interested in mutual assured destruction. Neither is USA interested in a hyperinflation for the next 10 years.
Selling hypersonic missile to pakistan will piss off indians for sure, but it would be against the missile export restriction. I believe its limited to less than 300km, and that is pretty much useless, because indian carrier would be parked outside the 300km.
not to mention, china probably don't want the technology leak, because hypersonice anti carrier missile is china's ace card against american carrier. uncle sam will be more than happy to give a few trillion loan to get some samples.