Given the change has remained there for about a week now, and the same change was made to Model Y your assumption seems...unfounded.
Possibly but there is zero precedence for this being the correct new way and I fail to see how it makes any sense.
Telsa clearly has increased cost for the wheels, tires, brakes ; is foolish to try and sell far fewer at greater margin in this manner.
As is hardly anyone would order it without the "free" extras.
The smarter thing to do is to figure out what the added bits actually cost Telsa and subtract them from the base Performance as the new performance price with the optional extras costing additional. The profit on the car is then maintained either way and percentage wise profit margin is higher for every base Performance they sell.
And there is precedence in summer of 2019 for a performance with 18's being on the website not showing any price difference. You could not order it online but when sold they were sold for less as you are aware. But when it first went on the site it was showing the exact same cost, same as now.
I will wait until one actually delivers or the website changes ; whichever happens first.