You can cross the border and walk into China from Pakistan and even take buses to Ürümqi. My family was there last year and I may have written about it somewhere or may be I have not.
A lot of what China is doing is true and a lot of it is not. China is a 1 party state and they react in a brutal manner and always have and now they have access to Technology. The (normal) Chinese people have no idea what their country does because everything is censored.
Loads of Pakistanees do business, study in China and can give you accurate information (if Pakistan) wants to.
Many Uighyurs also live in Turkey and British Muslims go meet them all the time and you can contact guys in many charities to get the accurate picture.