He should have written it with more formality and more rigor. Tesla is a public company and there is already a perception among investors that this is a facade. Musk needs to reposition Tesla as less of a personal experiment/quest and more of a legitimate enterprise that acknowledges its fiduciary duty to its shareholders. Tone and communication are very important in this regard. This release failed to adopt a tone and style of communication commensurate with the severity of Tesla's present situation. Instead, it feels like Musk is treating Tesla as he might a startup. In short, he's being facetious. I doubt the stock will plummet as a result of this, but it was certainly a missed opportunity to reassure investors.