Hello Mike!
The quoted paragraph mentions VI presets with CC11 assigned to Velocity XFade, but not that you should assign CC11 to Synchron Player presets.
If you look a bit further down on the same page, the following is written:
Note for SYNCHRON-ized Special Edition users: The steps described in this chapter are not necessary with the sound set “VE SY Special Edition”. Velocity X-Fade gets automatically turned on for rolls and turned off again after the rolls.
I will try to make it a bit clearer for the next manual version.
Best,
Andi
Vienna Symphonic Library