The truth is,
I've met with Xianjing people in London and questioned them about such confinement camps. Hearing their stories was disturbing. The issue exists, but most countries remain silent due to large Chinese investments in their country.
I have no doubt that the concentration camps exist. The people who talk about it are Chinese themselves, not some random guy, and they have managed to flee to other countries, with a few of them telling me that their family members are in the camps, but they have managed to flee to Dubai and then London. They don't really talk about it unless you ask where they are from and upon finding out the location I asked them about these camps etc.
Most Pakistanis deny this for being good friend of China and take it as western propaganda but the truth doesn't change with that.