You are right to be confused. TK is operating outside the law established through an ANAC resolution. This made it clear that only government charges and those emanating from airports could be included in ticket prices. Over time many carriers have ignored or rebelled against the law, most were eventually whipped into shape.

There was some confusion a few years back when ANAC revised legislation aimed at consumer protection, but I understand the confusion was that the revised resolution made no explicit mention of YQ, and some airlines assumed that detail had been rescinded.

I haven't lived in Brasil for some time, but I understand the original resolution still stands. You can contact ANAC (Brasil's national civil aviation agency) through email/Twitter etc https://www.gov.br/anac/en

Certainly Lufthansa continues to follow the practice of not applying surcharges to tickets originating in Brasil, whether one-way or round-trip. Which is why it's far preferable to book an M&M award trip to Brasil as two single journeys.

Currently the charges on one-way tickets to Europe out of GRU bought through Miles and More are less than EUR50.

Quite how Miles and Smiles handles award ticketing of its partners I have no idea. But you might try booking a Lufthansa or Swiss flight.

Of course if you are trying to take advantage of the current award sale with TK, that advice might not be helpful !