It is not really about believing it or not, I assume good faith in every conversation. Which means, I believe that you saw that. This should not even be on your mind.
I am asking for context because what you saw runs contrary to PLAN established doctrine (at least as I understand it, and as it has been announced historically so far). China has never even hinted at reaching a sum of 10 simultaneously serviced Aircraft Carriers.
As I wrote above, the current goals are:
One carrier group per fleet (3 fleets)
One carrier group for the far seas(4th fleet)
One group in training
One or two groups in repair/maintenance.
This gives a total of 6 or 7 carriers as the end goal. That does not mean that China will build less than 10 ACs btw. It means that it will service 6 or 7 carriers simultaneously (and new, better designs coming down the line will replace older and obsolete ones). Expansion before modernization.
Crystal clear? 20?
Guys, Aircraft Carriers are major surface combatants that require a ridiculous amount of money to field and service over their lifetime. Navies build said combatants at great cost, and they build them to cover specific needs.
Said needs for 20 ACs are absent in Chinas strategic doctrine. Just because you can do something, does not mean that you want to do it.