The media reports on this story are quite conflicting... Not sure who to believe. Is this guy an innocent whistleblower who's being targeted by Tesla or someone with an agenda against Tesla trying to sabotage the company?
That’s why we have courts. It’s not our job to decide he said she said cases like this in the public square where we simply cannot have access to the necessary data. Not saying courts are perfect, but at least they have the ability to get the necessary data.
Of course there's a conflict. Someone is claiming to be a whistleblower, and Tesla is alleging that he is a liar. I doubt we'll have resolution until there are legal proceedings.
The article covers your first question. He blew the whistle on misleading investors by overinflating production numbers by as much as 44% and that Tesla is knowingly installing damaged or unfit batteries into cars, increasing their chance of catching fire.