Would be an entirely different situation if either Mike Evans or Chris Godwin, 2 guys with pretty flawless track records, leave the game mid third quarter and make the same claims about being cut for not playing through injury (minus the theatrics, because that is an Antonio Brown exclusive). Those guys would have benefit of the doubt, Antonio Brown does not. He has less than 0 credibility.
I don’t know about the people who will be actually making investigations and rulings, but for me I would need to see concrete proof (a video, an audio recording, text messages) of Bruce Arians saying almost verbatim “I know you’re so injured that playing is a risk but you’re gonna fuckin’ play until your leg falls off if I tell you to.”