I honestly believe that employees did talk about his toxic behavior, the role of a successful startup CEO can be achieved with surprisingly little people management skills.
But the board handled this horribly; it's unsurprising they lost the fight, and frankly, listening to her podcast, the main question I have is why she was on the board in the first place. The level of articulation, the weak framing of events, etc, are what I'd expect to hear out of a middle-level HR rep, not someone on the board of a billion+ dollar company.