My understanding is that as part of a severance package she received in 2017 she agreed to some kind of "non-disparagement" clause. She then went on to write a book disparaging the company. The arbitrator didn't rule on the disparagement itself or if anything was true or false. Only ruled that she had to abide by the contract she signed.

It sounds like an interesting book, and I'll add it to the list. But it also sounds like she agreed to this in exchange for a lump-sum severance payment, and then broke the contract anyway. I'm not sure if this is really that principled of a thing. She sought-out and accepted a lot of money for this agreement.