I did read most of that, and it is interesting. First thing I want to address is this statement:

In conclusion, descriptions of detentions in the VETCs in the period between 2017 and 2019 gathered by OHCHR were marked by patterns of torture or other forms of cruel, inhuman or degrading treatment or punishment, other violations of the right of persons deprived of their liberty to be treated humanely and with dignity, as well as violations of the right to health.

Yet the statement I linked to was made in 2019. So if they had been gathering data for 2 years, why would they have made the statement I linked? This confuses me. It's not like they discovered the reality, or material conditions changed, since they made the statement; they had had years of data, supposedly. I'm going to set that aside for a moment and try to address the content of the document.

Also, yes I agree entirely that the treatment described in that section is completely unnaceptable. It mentions literal torture methods, unnecessary physical punishment, violation of right to determine or deny medical treatment, etc. None of that is acceptable. That being said, I am curious as to how frequently this happens. Not that any amount is acceptable, but if the rate in this region of these acts is the same as elsewhere in the country, then the framing of the issue needs to change from "targeted genocide" to a critique of the system as a whole. I don't have any data as to the occurrence rate of these acts in this region or outside of it.

Much of the rest of the report leading up to the part you mentioned is really much less bothersome. It mentions use of the surveillance state to catch offending parties. You may think this is invasive or unacceptable but, again, this is not particular to this region and would be a critique of the whole system. There's an attempt to criticize the use of imprisonment for punishment, which seems like a weird stance to take considering...the rest of the world.

In all honesty, I think the more damning part of what you linked would be everything after the part you mention specifically. The remainder of the document portrays traditional "genocidal" actions. I don't know what to do with the document since it does seem bad, but it's such a wild about-face from the reports just a couple years earlier, by the same group no less. More from 2019:

• World Bank Statement on Review of Project in Xinjiang, China by The World Bank was in favor or China's actions
• Resolutions by the Organization for Islamic Cooperation (noting that Islam is predominant amongst Uyghurs) was also in favor

So unless the conditions were so perfectly hidden from many investigative groups until they suddenly weren't, or unless the material conditions changed so much that none of the positive praise would apply anymore, I don't know what to make of the report you've linked.