Zhang resigned from Apple following a paternity leave and a trip to China, telling the iPhonemaker that he was going to work in the country for XPeng Motors. That reportedly triggered an investigation, since XPeng is also working on autonomous driving technology, which revealed that Zhang was caught on CCTV taking hardware from Apple's labs and transferring files to his wife's computer.
6 months is not long enough.
This is stealing trade secrets, then fleeing to a country that doesn't give a shit about that.