[1] is extremely vague wrt hard details, in summary it's a dispute between Brazilian standard conditions and Chinese standard with hints of "slave like conditions" but nothing concrete.
[2] is about Chinese workers striking to demand longer hours:
According to reports, the main reason for the employees’ discontent was the implementation of a four-shift system and a five-day, eight-hour work schedule. This would result in the loss of overtime pay, leading to a significant reduction in their income.
The pay scale can be debated but it doesn't support your claim above that the company forces long hours upon the workers.
[3] references workers striking for better pay, safer conditions, et al but doesn't mention slave like conditons etc. that you claimed
Shenzhen, Changsha, Huizhou, Shanxi, Shanghai (in China), the one in Thailand, in Hungary or Uzbekistan? (etc.)
I ask as Reuters reported the Shenzhen and other plants as having standard eight hour shifts less than two years past: https://www.reuters.com/business/autos-transportation/byd-re...
Do you have a source for claim?