It's literally just an American politician at the UN in 2018 citing "credible reports"

As an anarchist, do you often believe what US bureaucrats say? Because if you do I can give you plenty of links from other bureaucrats who don't agree with her

The World Bank’s work is driven by core principles of inclusion, with special consideration for the protection of minorities and other vulnerable peoples. When allegations are made, the World Bank takes them seriously and reviews them thoroughly. In line with standard practice, immediately after receiving a series of serious allegations in August 2019 in connection with the Xinjiang Technical and Vocational Education and Training Project, the Bank launched a fact-finding review, and World Bank senior managers traveled to Xinjiang to gather information directly. After receiving the allegations, no disbursements were made on the project.

The team conducted a thorough review of project documents, engaged in discussions with project staff, and visited schools directly financed by the project, as well as their partner schools that were the subject of allegations. The review did not substantiate the allegations.