https://qz.com/1599393/how-researchers-estimate-1-million-uy...
https://www.chinafile.com/reporting-opinion/features/where-d...
https://www.nchrd.org/2018/08/china-massive-numbers-of-uyghu...
Note the sources: Radio Free Asia (CIA propaganda group), Adrian Zenz (religious nutjob), etc.
Note the method: Estimates by satellite imagery and interviewing a handful of residents.
All of these reports that are used as evidence of cultural genocide are hearsay. Uyghurs are taught to renounce extremist beliefs not their culture as a whole.
Here is the actual report from the 'tribunal':
https://chinatribunal.com/wp-content/uploads/2020/03/ChinaTr...
Note that their 'direct evidence' are also just hearsay. I see no concrete proof of organ harvesting from Uyghurs. Maybe you can find it.
"Uighurs are allegedly pressured to renounce their culture" [1] More references is the Wikipedia article as well.
"China forcefully harvests organs from detainees" [2] Same article discusses the 1.5 million figure.
All of these are from basic Google searches. The information is out there if you look.
[0] https://en.wikipedia.org/wiki/Xinjiang_re-education_camps
[1] http://www.taipeitimes.com/News/front/archives/2019/11/14/20...
[2] https://www.nbcnews.com/news/world/china-forcefully-harvests...