Yes, but I find it very interesting that there were unfinished resources related to vehicles. It means Bethesda was contemplating or "toying" with the idea of adding drivable vehicles, but never implemented them in-game. That means a DLC is possible. If not, it seems resources are there to make it much easier for modders. Without those resources a very good drivable vehicle mod was made for FONV.
Remember when Skyrim was released, the devs announced that mounted combat wasn't implemented because they didn't know how to properly balance the game with it. BS. It wasn't there on release, because they weren't done with it, but were ready to release the game. Not too long after, they patched Skyrim with mountable combat, and made no other changes, so I doubt they burned the midnight oil trying to find a way to properly balance it. They just finally finished it.