> Altman began approaching other board members, individually, about replacing [Toner]. When these members compared notes about the conversations, some felt that Altman had misrepresented them as supporting Toner’s removal. “He’d play them off against each other by lying about what other people thought,” the person familiar with the board’s discussions told me. “Things like that had been happening for years.”

> ... [Altman's] tactical skills were so feared that, when four members of the board—Toner, D’Angelo, Sutskever, and Tasha McCauley—began discussing his removal, they were determined to guarantee that he would be caught by surprise. “It was clear that, as soon as Sam knew, he’d do anything he could to undermine the board,” the person familiar with those discussions said.

> The person familiar with [Altman's] perspective said that he and the board had engaged in “very normal and healthy boardroom debate,” but that some board members were unversed in business norms and daunted by their responsibilities.

> [Re: the board's silence after firing Altman] Two people familiar with the board’s thinking say that the members felt bound to silence by confidentiality constraints.

This seems to be the most concrete information about what he did since it happened. Sounds like he lied for years and justified it as "business norms."