Why would you expect otherwise? I fully expect any OEM to place itself at the front of the queue for parts coming from its suppliers. If for some reason they sold parts before the laptops started shipping, I'd fully expect impatient customers would build complete machines from parts ahead of the shipping dates, which would wreak all kinds of havoc on logistics.
It's unfortunate that they can't sell you something that hasn't been manufactured? That doesn't yet exist?
HN is really scraping the bottom of the barrel for things to complain about.
On the other hand, nrp, since you're likely to be in this thread: if you had pre-orders and/or batched shipments of parts/upgrade kits, I would likely be paying a deposit or even the full price today, rather than ordering in a few months. Even if that meant ordering a full upgrade kit with a new display, but getting the upgrade sooner, I'd probably still go for it.