I would be mildly surprised if the base mapping in a Volkswagen were provided by TomTom, though it's not impossible, and certainly there might well be an arrangement with TomTom for real-time information.
I'd be even more surprised in the case of a BMW, however, since they are part-owners of TomTom's main competitor in the mapping space, "Here".
HERE was Navteq, was bought out by Nokia and subsequently rebranded HERE, and then bought by a consortium of Audi (hence the question mark over VW), BMW and Daimler/Mercedes. There are now a few more companies in the consortium.
Given the ownership, I strongly suspect BMW Nav Data is supplied by HERE, and I'm pretty sure they have their own real-time traffic systems.
Incidentally, I believe Garmin uses largely HERE mapping.
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