Earlier quoted context omitted.
My guess is because in Germany they're taking a loss due to actual competition, and making it up in other countries like Austria where they rake in higher profits than in their home-land.
So anti-competitive practices are the norm in Austria but no one would dare try it in Germany? Truly bizarre theory.
Government project tenders are often notoriously intransparent, as ironically evidenced by the fact that the government hasn't been able to stand up a price comparison database for months, as also mentioned in TFA.