The BBC's words are 'alleged', 'impossible to verify' and 'reports suggest'. The other words are not the BBC's, so what is your basis for trusting them and do they fall into one of the patterns I've described above?
Incidentally, most of the current furore stems from that chap they've mentioned, Adrian Zenz - exactly the sort of single origin I mentioned above. For a "leading expert on China's policies in Xinjiang", he's spent remarkably little time on it - up until 2019, his focus was on Tibet, despite not speaking any Tibetan and never having been there. He doesn't speak any Uighur, either, and his sole trip to Xinjiang was once in 2007 as a guest of the provincial government.
How about the professional opinion of a highly qualified and experienced QC? Or will it take video of Xi personally raping an Uighur woman in a concentration camp before you admit that the CCP's amorality, racist ideology and sadism make them the spiritual descendants of NASDAP?