I think that you SA is telling the truth that he doesn't know any more than you do. However, folks that are in their EDD window have a high probably of getting their vehicle shortly, so his advice there seems off. However, if the EDD is a couple of months out, then it isn't accurate and will change quite a bit, so your SA is correct in that regard.
We do know that the MYP ships much faster than the MYLR. Likewise, black interiors faster than white interiors, and busy delivery centers faster than deserted delivery centers. Not sure about exterior color, tow, FSD. I'm actually surprised that FSD isn't moving cars faster to customers since it is $10k of pure profit for Tesla (all cars ship with the same computer, so FSD is just an enable check-box). And I haven't been paying attention to 5-seats vs. 7-seats shipping times.
Scott
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MYLR | Red ext | White int | 19" | 5 seats | tow | no FSD | Order 07/31 | Profile 07/31
EDD: January
DC: Stockton