Yes, because of work that I have done in the past. I have seen the level of process audits that the automakers require of their suppliers, and I have seen the kind of process management software that is used to track requirements/specifications/changes and all the rest of that. That being said, I have no recollection/memory of how VW does things.
When all of this is in place, you can't change a single line of code without it being justified, specified, written, tested, and finally signed off on, and *everything* is traceable. Could one hack the database? In theory, I suppose, but doing so would elevate this to a whole new level of fraud, and if you screw it up and corrupt the database then the whole company could be dead in the water.
Google "Automotive SPICE" to learn more..