I just looked at the owners manual in my Tesla ,ive ordered the 90d but just confirmed no vin yet. Anyway in the manual it shows active spoiler and has this statement
The Model X has a rear spoiler designed to improve aerodynamics. The position of the spoiler can vary depending on the status and speed of Model X: • When Model X is in Reverse or when driving speed is below 10 mph (16 km/h), the spoiler provides maximum visibility behind Model X. • When driving speed exceeds 45 mph (72 km/h), the spoiler lowers to the position that provides the most effective aerodynamics. • When Model X is powered off and locked, the spoiler retracts. To allow the spoiler to automatically move as described above, touch Controls > Settings > Service & Reset > Spoiler > Automatic. To disable automatic movement of the spoiler, which keeps it in its extended position, choose the Extended setting. Note: If the spoiler can not automatically lower or raise, the instrument panel displays an alert.