The former might not be true either. China has 1.7M listed, but if you include 1M to 3M in forced vocational education and training centers, the count would be higher than the 1.8M in the US. The rate would still be lower though.
https://foreignpolicy.com/2020/07/01/china-documents-uighur-genocidal-sterilization-xinjiang/ https://www.reuters.com/article/us-usa-china-concentrationcamps/china-putting-minority-muslims-in-concentration-camps-us-says-idUSKCN1S925K/ https://web.archive.org/web/20200728165111/https://foreignpolicy.com/2020/07/01/china-documents-uighur-genocidal-sterilization-xinjiang/
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