I think we are talking past each other.
This has nothing to do with new models. It has to do with product and pricing changes. I've owned >25 vehicles in my life, and have owned Tesla cars since 2012. I've been a gearhead for almost 50 years and had subscriptions for most of that period to the auto mags. I've worked in auto dealerships. I can tell you for absolute certain that the sales models are totally different.
Sure, other manufacturers change their pricing to dealers frequently. But the price to the buyer is whatever you can haggle around MSRP (which doesn't change within a model year) minus any advertised customer incentives.
Tesla has a fixed price. Other than purchasing inventory cars where a mileage discount is applied, the MSRP price is the price. But Tesla changes that price whenever they want. Nothing to do with model years or annual cycles. That's a different model. It just is.
Now if you want to say that you can get $5k in variance of price across dealers on the same vehicle in the dealership model, I'd totally agree with you. But that's different from the $5k price change Tesla makes in 1 day in their direct sales, fixed price model.