No some of their shorts have shorter legs or more accurately some of their shorts have longer legs. I am guessing your shop carries the long legged ones as they seem more popular with us older guys that can afford Assos.
The "Long" version is 4cm longer than the "Regular" model. The "Long" version in size medium on me (179cm tall, 86cm inseam) is not just above the knee but fits perfectly. The "Regular" would be too short in the leg.