I feel the need to remind everyone that the same was said about Nintendo when they waited until January 13th, less than 2 months before the Switch’s launch, to reveal the details, and look how well that turned out for them.
And the Switch had months of shortages after launch, especially in Japan. But this was fine because it launched in March and there wasn't a massive holiday around the corner to get the consoles to customers by.
When launching a console in November, they have to make as many as possible available within the first month because everyone will want it by Christmas. A longer lead-in time is needed so they know how many consoles to have available within that first month. At this point they may have started producing the consoles, but they're flying blind about how many they'll need until the price and release dates are public.