TÜV testing has been a legal requirement for seven decades, the results are not secret, there is no evidence of bias.

The level of weird conspiracy stuff Tesla astroturfers come up with never fails to amuse…

I don’t think it’s that odd. You reasearch just wasn’t very good. If you e.g. search for “Querlenker” in Tesla’s largest German forum you’ll find plenty of results. And I would bet it is the same in English language forums.