You’re suggesting they are intentionally sand bagging the car. That happens say when you have a higher end model you don’t want to get too close to but this will never get close to the Plaid. So why would they make it slower on purpose?
My opinion is what they announce and you can get will be the best the platform can offer with the components used. Will they improve it over time, of course that’s what Tesla does. But this new car when they ship it, I don’t think they will be some magic £2k option that’s going to reduce 0-60 by 0.2 - 0.3 seconds.