The problem is still that he, who has all the resources in the world to deal with this in proper PR fashion, resorted to "lol you suck that's why you were let go" on Twitter. Even on the scenario what she is saying is 100% false - which is, for all we know, a "I chose to leave/She was let go" debacle, he is still not in the right, specially due to his position, to throw her under the bus like that.
Like, erase that part from his tweet and none of this happens.