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No nuance here but using my a-level German I think he's says he has no proof because he never looks at wheels but he means it more along the lines that he didn't have the authority to and that if those who had the power took this seriously they'd uncover widespread cheating.
I stand to be corrected on all of that though
So, yes sensationalist and without proof but not as baseless as it could be i guess...
From google translate (so I apologise if I missed any nuance in the German):
Sensationalist article without any proof. Useful...