If we cross analyse this with the article on the 10M produced by December: That told us they wanted 5M produced by September's end, those units were meant for launch and would likely get there in time by boat.
If they're using air freight in October and beyond, it means they want units from the second 5M (those produced in October and very early November, so 1/2M?) on shelves at launch too. They're aiming to sell 6+M AT LAUNCH, with many more coming in for Xmas too. They want this launch to be absolutely massive.
The PS4 was the fastest selling console of its time when it launched, and it passed 10M in sales in August, the PS5 is looking like it's aiming to get there by the end of February at the latest.