Earlier quoted context omitted.
If making delivery vans for one of the biggest users of delivery vehicles in Germany (that uses tons of VW vans currently) is "a small project outside their core competency", VW really is in trouble.
Most van companies offer a "chassis cab" option [1] - basically a van with the cab present, but most of the back missing. There's then an ecosystem of companies that will work with end users to design, build and fit custom van bodies. If you want a mobile broadcast van, or an ambulance or a mobile command centre? That's where they come from. If you see delivery vans that aren't standard models, they've almost certain…
Given that VW's CEO has been whining to the press about how annoying it is that VW is now not their customer but a competitor, they clearly now think that they should have wanted the job more. My guess is that they did not expect the Post (which as a massive, formerly state-owned company you'd expect to be fairly conservative) to risk going their own way and succeed with it, and thus misjudged the risk involved with letting them pass.