Elon believes in doing his own PR, but Tesla does not, simple as that. If I'm to believe that Tesla does believe in PR then, as I mentioned in response to another user, I'd wager they'd be doing a lot more to improve their image given how much of a negative impact Elon's poor attempts at shaping public discourse via Twitter has had on Tesla lately, where their stock is at, etc.

An "about" page is bog standard stuff and a pretty paltry effort in the grand scheme of the things a PR department at a company the size of Tesla would otherwise traditionally be doing. It's like, yes, technically that's a form of PR, sure, but it ain't much.