as I said, you did not explain why you chose that date over any other date, and more importantly why doing so makes sense. Until you do that it is an arbitrary date that you decided to choose for no good reason (arbitrarily) / because it fits your narrative, not because it is objectively the right / best day to base this on.
Why is it the day DDB started over e.g. 6 months after WotC bought it (so they had time to make their changes) or the date they first offered preorders at all? The last one seems a lot more relevant to this discussion, yet you chose another, that choice needs a justification or it is arbitrary…