And who doubted the independence of european courts

Amazon has just scored a major victory in Europe's second-highest court.

The American tech giant on Wednesday saw a €250 million ($300 million) tax bill assessed by the Eropean Commission's antitrust regulator back in 2017 overturned Wednesday in a ruling by the EU's General Court, the second-highest court in the land. The money was supposed to be paid to Luxembourg

In the decision, the court argued that EU regulators had failed to prove that Amazon had received an illegal advantage from certain decisions made by the Luxembourg government. Amazon said it welcomed the court's decision, "which is in line with our long-standing position that we followed all applicable laws and that Amazon received no special treatment."

So the government of Luxemburg was found wrong on their decision that amazon had illegally received an advantage.
The EU general court decided in favour of a business against one of EU's member stated.

Proving the ECJ is impartial in its judicial decisions.