Wow big statement here. IMO, a bad move from China. Germany is the most Sinophile country in the EU and the Nazi history is an extremely sore spot for Germans.
I can assure you, as having met Germans personally, this is not a good move for China. Most Chinese probably dont know the extend of it, but the WW2 is such a traumatic experience for Germany that they should avoid mentioning it as Germany avoids mentioning Taiwan.
Global Times should be reigned in by the diplomatic corps for this statement.
However, on the other hand this shows an strengthened China growing increasingly assertive towards its internal matters and it wont tolerate any statements toward Xinjiang from any country. So China from all this is showing that it must now be treated as a proper Great Power. Gloves are off.
Lets see how the EU and Germany react.
WW2 and the holocaust are very sensitive topics for the Germans. But have the German government ever thought about how sensitive Xinjiang is to China? Have they ever thought about Islamic terrorism, and the near-fracturing of China during its century of humiliation? Have they ever thought about the historical human cost of internal strifes in China?
Forget about Taiwan for a minute. First, Genocide is a heavy crime to accuse another country of doing. It is even more enraging when it is blatant slander. Second from that slander, the EU could impose sanctions on China. Both are potentially very damaging to China both diplomatically, and economically.
Accusing another country of genocide is practically wartime rethoric. Its a tried and true method by Western Powers for creating a Casus Belli for war. Hence, China is right to be extra sensitive to this.
If Germany proceeds to lead the EU to impose sanctions on China based on the slander of Genocide. I'm 100% behind China to hit back hard. Germany and the EU must learn their place and their history. Germany, France, Belgium, Italy, and Spain are responsible for genocides far worse in magnitude and cruelty than whatever they are accusing China of doing.
If Germany can accuse China of fake genocide. Why can't China remind Germany of its actual genocide in WW2? That is far from debatable.