There are a number of small diameter type weapons like TL-20 that have been shown and tested by the Chinese aerospace industry.View attachment 64019
TL-20 air-to-surface missile, range 60-100km (most commonly quoted as 85km), Beidou and inertial guided, length 1.8m. It's apparently smart enough to be able to tell between wheeled and tracked vehicles. The article says it's uniquely suitable for decapitation strikes.
J-20 can carry 12 in it's main weapon bay, J-16 can carry 20.
Given the news we've seen recently on J-20 being based close to Taiwan the emphasis on decapitation strike certainly seems interesting...
But we have yet to see any of them be in service with PLA aircraft, and certainly we have yet to see J-20 be equipped with one. That isn't to say J-20 isn't or won't be equipped with one -- I very much do expect it.
However I don't take the claims from your source that seriously. Consider being a bit more discriminatory in future.