I'm not one to downplay this great achievement, but do we know what kind of shipments this is?
I remember for PS1 and most of the PS2 era, Sony would bolster about "production shipments", which only meant they had produced a unit, and hadn't even really shipped it to a retailer yet. That created A LOT of confusion back then. And, to this day I'm not entirely certain if the numbers we have for PS2 shipments are entirely correct. They changed the metric halfway through the gen.
So, forgive me, but I'm not a hundred percent trusting of Sony's announced numbers..