To add to my other thoughts, I truly don't believe Tesla is manipulating or phrasing things a certain way to get people to order more. Remember, Tesla doesn't count a delivery until that car is in fact sitting in that owner's driveway. There is ZERO benefit to doing this, and it can hurt their reputation and compound the stigma that Tesla never meets its deadlines.
I honestly think Tesla is very much childlike in their optimism for meeting deadlines, and they truly do believe they can hit their estimates. I do believe that they really thought they could ship the cars in March, then went, "OK, we'll surely make next month," and so on, until they finally delivered the first car in June. You could actually see how triumphant and proud the Tesla Team truly was for finally getting this car out. Tesla likely never even imagined this amount of hardship that would occur with the new MS launch.