Vehicle electronics and plant automation / engineering are two wildly different things.
Knowing anything about a proprietary protocol that there is little known about, outside of VW Group. It's easy enough to get VAS to edit some things in the PCM/BCM, but that has nothing to do with the underlying protocol.
But back to my point, if you're looking to work in the plant engineering side, knowing anything about VAS isn't going to help you get there. Plants don't run off of VAS just as cars don't run off of ladder.