I'm trying to read the tea leaves and there seem to be quite a few reminders that OpenAI is a non-profit, it's supposed to further the goals of all humanity (despite its great financial success), it's controlled by a board that largely doesn't have a financial interest in the company, etc etc.
Maybe Altman has been straying a bit far from those supposed ideals, and has been trying to use OpenAI to enrich himself personally in a way that would look bad should it be revealed (hence this messaging to get in front of it).