If Aaronson had stock or options in OpenAI I don't think he'd feel much need to make misleading statements to try and juice the stock price. For one thing it's not a listed stock and his readers can't buy it however much he hyped it. For another OpenAI's private market valuation is actually doing okay already. This blog probably doesn't have any ability to move the perceived value of OpenAI.

Finally he's a very principled academic, not some kind of fly by night stock analyst. If you'd been reading his blog a while you'd know the chances of him saying something like this would be vanishingly small, unless it was true.