The poster above you provided a link.BYD contracted a Chinese construction firm to build a factory in Brazil that the Brazilian labor authorities shuttered over the slave like working conditions.
There were accusations and reports for their factory in Brazil (source: BBC, as well as many others at the same time). I personally didn't look much further into it and haven't tried following the story since, but I would research if I was looking to buy a car.
Xinxiang propaganda is a politicized process that involves shit talking 100% against China more than truth about any current oppression.
BYD, like most Chinese EVs are manufactured with extensive robotics. They are not manufactured in Xinxiang. Xinxiang mining activity is mostly for solar panel inputs. Not EVs.
There was a construction company BYD contracted out of China to bring Chinese workers to construct a factory in Brazil. It was shut down by Brazilian labor authorities for “slavery like” conditions and treatment if the Chinese workers.