There are far too many assumption. First we have the 990 vs 980 discussion. Second, that’s not how upgrades work (if you buy a computer with a proprietary component already included vs buying the part later it’s always cheaper to buy it at the time of purchase as “bundled.”)
This $2k actually aligns well with my thought process some time ago when the “uncork” discussion was in full swing. I would not be surprised if all LR AWD motors are NOT capable of becoming 3P motors, but they are all capable of being at least somewhat faster. This speed increase may actually be the limit of where the lowest common denominator sits. You can imagine how pissed off owners would be if some of them could upgrade to full 3P but others couldn’t due to motor revision.