How do we know this is always the case? Perhaps the transaction worked for you that way, but that need not be the universal experience. This is why we need Tesla to confirm these numbers.
I'm not sure why you think there is variability here. It's quite explicit in the order process and does not leave room for different experiences. If someone instead chose to first refund their reservation, they'd then be unable to order a 3 (at present). Additionally, this would result in significant additional card processing fees for Tesla. It's similar to saying that you feel that people ordering an S today in the US may or may not pay a $2,500 order payment. It's a uniform process for all buyers.
Nope. 450k+ was confirmed in May, after the conference call. Data about 23% refunds said most were in April. If so, those refunds failed to diminish net number of reservations. The end.
No. From the Q1 shareholder letter, emphasis mine: "Model 3 net reservations, including configured orders that had not yet been delivered, continued to exceed 450,000 at the end of Q1"
Again, I think this cancellation report is a mountain out of a molehill. But let's be specific and objective with our theories and data.