Totally believable. They’re not at all underreporting workplace injuries. Oh wait, except they also got investigated by the state of California for that too:
Tesla's the biggest target for many journalists, the records are available via FOIA requests, and it's an obvious follow-up given the earlier stories. Tesla makes their workplace safety statements in annual reports, so proving a falsification of those reports is securities fraud and a big deal.
So if Tesla is lying, look it up via FOIA, file a whistleblower report with the SEC and cash in.
Two articles that are 3 and 5 years old about an investigation? That's your evidence? Sounds like it went nowhere because if it did you would have posted that.
https://www.latimes.com/business/story/2020-03-06/tesla-left...
https://revealnews.org/article/tesla-says-its-factory-is-saf...