The original research came from FTM:
https://www.ftm.nl/artikelen/vws-taaleis-duits-lab-testcapac...
https://www.ftm.nl/artikelen/coronatesten-belangen-arts-micr...
However, this stuff is paywalled by now.
https://nos.nl/nieuwsuur/artikel/2346643-testlabs-kunnen-wel...
Or, an easy video summary by Arjen Lubach (has english subtitles): https://www.youtube.com/watch?v=JUx-kdbKQys
The lobbyist, part of the Outbreak Management Team, is Ann Vossen. And she argued from her experise that there should be specific requirements that effectively kept larger laboratories from being able to be suppliers. Ironically, the trick used was the Tower of Babel (pretending language differences could be a risk)