It seems like they're also making fewer of the older model Pis (though I don't know if this is confirmed) since the silicon for the BCM2711 can be had in greater quantities than the older chips in the 3B+, 3+, and earlier models.
They're making 500,000 units per month, supposedly (though I don't doubt it), with a million or two orders in the backlog.
I know most people I've talked to who want to order anything less than multiple hundreds of units are unable to do so right now, and scalpers on eBay and Amazon are charging outrageous prices for the few Pis that end up in circulation :(
[1] https://www.raspberrypi.com/news/production-and-supply-chain...