I decided to try my hand at this route today and on the selection screen it says it is 10.5km but it is actually around 11.3km if anyone is interested. I didn’t notice if there was a lead in listed or not.
There is a 0.5km lead in (see e.g. zwifthacks (dot) com - online tools - routes).
Thanks for the info on the lead-in. I wish the route was listed at its proper length which is longer than the lead-in and the displayed length combined.