There are still three different chainstay options - "small" "medium (standard)" "large" - for the V20. I imagine that the vast majority of people - like 85% or more - the standard chainstay will be a good fit and a good balance between BB height and seat height. Very few large and small chainstays get ordered.
The old faithful sizing chart that has been around a long time appears on the S30 page, but not the V30 page. It's presence makes it sound like it is still applicable but I doubt so. Due to the change in the V30 boom there should be a wider range of adjustability than the Vendetta 2.0 boom design. With a shared boom between V30 and S30 it doesn't make sense that the Silvio has such a wide range of adjustability that Vendetta doesn't.
Could Cruzbike confirm or update the diagram and put a description of chainstay lengths on the V30 page. Sizing information is extremely important for new buyers!