Not exactly, although he does mean that 30-series, 40-series and 50-series would pile on the 20-series (that are built by the J-20, Y-20, Z-20 and H-20).What does he mean? There will be J30/J40/J50 in the near future?
Generally speaking, the meaning would be:
It's just a way of saying newer generations and platforms making older ones obsolete but the gist of it is to imply the progress and improvement.