Historically, from what I have witnessed, Tesla have honoured price cuts (and ignored price increases within their control) based upon total order value. But if some individual items rise, they will have affected any saving.
Basically, a price adjustment will have revalued the whole order at that point in time. You will have paid the lesser of the original total order, or the new revised price total order.
What the above means is that if something, such as FSD rises in price, but base model reduces in price, you will have paid the higher FSD price, but lower base price. It is the lesser total order price that they have honoured, the original price, or new revised order price.
Historically... and lease orders are more complex.