Tesla have always (eventually) respected what was shown at the point a car was ordered. Way back in May 2019 when I ordered the Model 3 came with the Homelink garage door owner, but this was removed before deliveries started in August. After raising a service request and them thinking for a while, they agreed to come and fit it via a ranger. Also at that time the UK web page hadn't been updated to show Premium was 1 year, after a year and a number of people complaining and threatening legal action, Tesla gave everyone with early orders unlimited Premium.
If (unlikely) there was a price drop, then you could change your order to the lower price, but then would get features at that point.