It's a bit tiring to do the source work myself tbh, I'll respond more later but again the first article you shared has nothing about schools. The UN report it's based on like 3 links further has some information about schools, doesn't seem to be boarding schools but I'll look into it later:

https://www.ohchr.org/sites/default/files/documents/countries/2022-08-31/22-08-31-final-assesment.pdf

The other article is again mostly US state propaganda that is just stuff like

More than one million Uyghurs and other Muslim minorities, including ethnic Kazakhs and Uzbeks, have been detained since 2017, according to international researchers and U.S. government officials. (Some watchdog groups put more recent estimates closer to 1.8 million)

One million is quite the number, yet there never seems to be any concrete evidence supporting this. Satellite images don't count, not since the "WMDs in Iraq". I'm gonna bet "international researchers" is again just Zenz. The "watchdog group" links to an article by rfa, so it's literally just the CIA. Like what the fuck is this, why are the only like a dozen Uyghur people protesting this and why is constantly pushed by the US state departement, CIA and the likes who have never once cared about foreigners ever??

The only thing about schools again is

Many families have also reported that their children were taken to boarding schools without their consent.

It links to this https://www.ohchr.org/en/press-releases/2023/09/china-xinjiangs-forced-separations-and-language-policies-uyghur-children which clearly states at the bottom

Special Procedures’ experts work on a voluntary basis; they are not UN staff and do not receive a salary for their work. They are independent from any government or organization and serve in their individual capacity.

and is a few paragraphs like

The experts received information about large-scale removal of children, mainly Uyghur,

What information?? Witness testimony? Pictures? What's large-scale? Dozens, hundreds, thousands, millions?

Why is it so difficult to pin down actual verifiable evidence. Or witness testimonies. Any group oppressed historically had solidarity movements, jews during the holocaust, palestinians, native americans, where are the uyghur grassroots movements?

Can you at least understand why a skeptical reading of these allegations leaves a lot to be desired?