Yeah, sounds best. I'd still run it past the lawyers to make sure it's fine to "badmouth" a former employee in your jurisdiction.

It means taking ownership of the mistake, even if it does mean that you're effectively apologizing for devaluing the company to the other stockholders and other stakeholders.

Still, there's a little bit of "oh, so when I leave I can expect management to talk shit about my performance", which wouldn't do wonders for my impostor syndrome.