Bruh the fucking US State department admits there's no such thing

The only countries accusing China of mishandling the ETIM in Xinjiang are its geopolitical rivals in the west. Muslim countries and the global south side with China on this.

35+ mostly muslim UN states have approved of how China handled this after sending delegates and diplomats to Xinjiang:

...separatism and religious extremism has caused enormous damage to people of all ethnic groups in Xinjiang, which has seriously infringed upon human rights, including right to life, health and development. Faced with the grave challenge of terrorism and extremism, China has undertaken a series of counter-terrorism and deradicalization measures in Xinjiang, including setting up vocational education and training centers. Now safety and security has returned to Xinjiang and the fundamental human rights of people of all ethnic groups there are safeguarded. The past three consecutive years has seen not a single terrorist attack in Xinjiang and people there enjoy a stronger sense of happiness, fulfillment and security. We note with appreciation that human rights are respected and protected in China in the process of counter-terrorism and deradicalization.

We appreciate China’s commitment to openness and transparency. China has invited a number of diplomats, international organizations officials and journalist to Xinjiang to witness the progress of the human rights cause and the outcomes of counter-terrorism and deradicalization there. What they saw and heard in Xinjiang completely contradicted what was reported in the media. We call on relevant countries to refrain from employing unfounded charges against China based on unconfirmed information before they visit Xinjiang.

And as another user said, this is a great video about Xinjiang with sources in the description.

Also you can literally just visit Xinjiang and see it for yourself. There's no restrictions on travel now that covid is mostly over there. There's tons of videos on YouTube doing just that.