It is 2 months after April Fool, quite late to make such a joke.
I can concluded that the writer is either unfamiliar with the concept of Military Logistic or Military Science, or this is simply a joke article to have that Ha-Ha moment.
At first glance, to satisfy the bulk of Chinese Army (some 2.6 millions strong), you will need about that much to just go around, the problem is, if you want to mechanise an Army, you cannot just look at the number and say we need this much.
The basic premises is that those 1,000 T-20 is not going to fly itself, and they are not going to fix itself, so by having 1,000 Y-20, you will need 4-6 (2 crews, 1 flight, 1 relieve) pilot each, 3-6 crew chief and load master, and about 5-10 teams of mechanic to fix it, when you put 1,000 planes in, you are talking about 20-30,000 extra personnel, and seeing Y-20, like C-17, is going to be forward deployed, how are you going to deploy 20,000 or 30,000 extra personnel in a forward position in addition to the 2.6 millions soldier you have to support? I know, let's build another 100 Y-20............See where this going?
There is a reason why a global force like US Military can only afford 25% mobility. And now you know why.