I had to look up what "NiUS" is. A populist right wing channel which peddles racism and xenophobia, climate change denial, anti-LGBT+ agenda, and generally all the kinds of lies and twisted statistics that you'd expect from, as one source called it, the German Fox News. Do I have the right of it? I hadn't heard of them before this.
If that is indeed what NiUS is, then this has to have career-ending consequences for Voeller at the association. Everything about this gave the impression that he was there in his role as DFB official as he sat there talking about his national team, dressed in his DFB shirt. Even if it was apparently not an interview cleared with DFB (according to ntv) this would reflect extremely badly on them if they ignore this incident or let him get away with just a warning. He is too experienced and in too prominent a position to excuse himself with claiming he did not know what the channel he was visiting for the interview stands for. I never took Voeller for the smartest or most sensible cookie, but this is outstandingly dumb even for him.
As far as I could find so far no statement, neither by Voeller nor by the DFB, has been made so far, despite quite a few news outlets having picked up on the story thus far and the interview having happened even before their game against Austria on Tuesday? Are they hoping to just quietly sweep this under the rug or have they just been unable to figure out their response even several days later?