Tesla will lower the price shown in your account. You don't need to do anything to get the lower price.
FYI for anyone else who might find this useful. The price did not update automatically, but per my SA's recommendation, I was able to go to "Edit Design" and reselect the same options which updated everything to the latest pricing. I'm the sure the SA could have done it if I waited for him, but I was impatient and wanted the $2K savings to show up!
Honestly, this may free up enough money for me to take a gamble on FSD. I don't think the 7 confirmed FSD features are work $7K, but I would feel better about spending $5K more than I originally planned rather than the full $7K (I realize this is a terrible way to justify purchases

)