This has been circulating and been laughed at for a few days in Chinese forums.
One simple counterpoint, if there were some defective packs, why not return those packs?
Why would Tesla risk bad packs to be on the road creating liability for them?
Also the source of the rumors is not an anonymous employee as hinted in the article, it’s just some random dude posting on a forum claiming to be an employee.
IMO this seems to be part of an campaign to pump BYD, which has been going on for a while. By trying to attack CATL and Tesla at the same time, they want to claim BYD should have the market cap of CATL battery business and Tesla car business combined