Adrian Zenz is a commonly cited source for estimates on the number of people in China's vocational training centers. But, who is he and what is his background? The Grayzone, an independent news outlet, published some findings on Zenz: he's a senior fellow at the Victims of Communism Memorial Foundation, he claims there are "over a million" Uyghurs in China's vocational training centers, and he bases his claims on a single report from Istiqlal TV, a channel that advances a pro-Xinjiang separatist agenda.