As others have pointed out, the issue is the SEC settlement that Musk agreed to. But to your question, yes, I think what he tweeted was bad, for a CEO and an engineer. The number he stated is literally off by 20%. How can you say what he did was an “honest mistake”, as if an engineer can’t be expected to know basic arithmetic? Or a CEO not to know that the peak rate of production per week is not the same as annual rate? Musk has all the info needed to make an accurate and still impressive claim — he chose to exaggerate. And he chose to do it after knowing the terms of the SEC settlement.