If a grainy satellite photo that could be of literally anything and random testimony is your standard of evidence please stay the fuck away from any position of authority, everywhere.
China has 56 different major ethinicities and 5 different autonomous regions. The only racist here is you, for believing this shit and knowing nothing about the country. The two fastest growing ethnicities in China are Tibetan followed by Uighur.
their attitude towards non-chinese within their borders lead me to have very low expectations on how they will treat minorities outside.
"Chinese" is not an ethnicity you racist dumbass. It is a nationality. They are all Chinese.