Yeah the tape measure does not lie, and I plan to measure upon delivery to see if I got the lowered suspension on my bill. The ride height should only differ by half the diameter difference of the tires approximately if the same suspension is used. Air pressure and vehicle weight (performance weight 14lbs more than the Long range) also impacts this. If you see only a couple millimetres of difference between the performance and long range, then Tesla is not providing lowered suspension.
18” AeroWheels (235/45R18) = 26.34” [669mm] diameter
19” SportWheels (235/40R19) = 26.42” [671mm] diameter
20” Uberturbines (235/35R20) = 26.50” [673mm] diameter