I'd be surprised if significant numbers of orders placed now deliver in 2023, and agree that Rivian needs to provide that guidance, even if it is likely overly optimistic, to new buyers.
Rivian production of only a more or less standard R1T seems to be approaching 30 per day. If we believe that Rivian will start delivering both the Max and the R1S starting in 2023, that almost certainly means that production numbers will decline somewhat as the new variants are introduced. They will ramp up again, but it will take some time. It will be an incredible accomplishment if Rivian can increase production to 30,000 R1's next year, essentially doubling 2022 numbers. I'm sure that there will be some new orders in the 2023 Rivian production, but likely not all that many. While impressive, a 30,000 unit run will still leave more than a few legacy orders outstanding.
As I always say, I'm happy for this not very optimistic speculation to be proved wrong