Not sure how there could be a miscommunication. Seems simple enough. Micah or his people call the producers and say he won't be on. Not sure how there could be miscommunication there.
My guess is that Parsons didn't convey to his people clearly that he didn't want to go on, no one from his camp then informed the show he wouldn't be on, and now while in damage control, they are claiming it was just a miscommunication between his people and the show. It seems way more likely it was miscommunication between him and his agent/people. Seems like an easy thing for Parsons to do - hey agent, call the show and tell them I am not doing it.
If Parsons has enough time to get in twitter beefs with people and PFF on how he played, then he has enough time to clearly tell his people to let the show know he won't be on it.