I don't think these are actual experiments. They serve a specific function.
Prior to the incarceration of Uighers, the CCP has been conducting organ harvesting from political dissidents from Tianenamen square up to HK riots and religious groups such as Falun Gong.
What's different with Uighers is there is also the rape of women and sterilisation of men. Over time this reduces the dissident population in their western territories and then can make a profit from the venture by using slave labour and harvesting organs.
China is a nuclear power, You can't just declare war on them like the allies did against Nazi Germany. China will continue with the Uighers and then move on to eradicate the Tibetans next. There's nothing anybody can do (or would be willing to do).