With an undercover story like this, it would have been the easiest thing in the world to switch between reporting the actual story and scenes detailing the undercover reporter's personal experience of being undercover. Add a bit of drama and thrill. Maybe there were close calls, etc. Alternatively, use the parallels with Wannsee to make it more unnerving and scary. Swap back and forth between the meetings.
I am by no means above stuff like that. I love scary, political thrillers. I wouldn't have objected if they had told it like that.
Still, I appreciate that they didn't. Probably because the story is scary and ugly enough as it is without adornment.