Disney doesn't own everything. All they own is ABC and even then it's kinda a brother sister relationship.
Disney's media control isn't limited to what they own - the are also influential in other networks. Disney is a 600 lb gorilla.
According to what he has written here, they had not made a final decision at the time of this meeting - he was still scheduled to work. They contacted him for a follow-up meeting, which he did not attend because he was "too stressed" and wanted to reschedule it. But was unable (in his words) to contact them to do so - so in effect, he blew them off. That's when he was fired. They had tossed him a lifeline, and he ignored it.
Actually, to me it seems more like they wanted him to sign termination papers, return company property, and remove any personal property. no lifeline.
When I was fired, I was asked to come in, and no reason was given. I clocked in, arrived at the manager's office and waited. She arrived, and the exact words that she told to me is "you've been accused of a terminable offense, and as such, you are being terminated. I need you to turn in your ID, sign these documents, and clear out your locker." I was not given an opportunity to say a word in my defense, or request a shop steward, and no investigation was performed.
CM's are nothing more than a line item on Disneys budgets.