You are misunderstanding what you are reading.
While there is a maximum weekly benefit (not, how many weeks, but how much per week) there is on wage replacement, that cap does not apply to medical bills.
You should not be advising your brother to do anything, since you do not understand how the process works. Or rather, the only thing you should be advising him to do is to speak to a workers comp attorney, who does.
Two things I am tired of typing: 1.) A wrongful termination does not mean that you were fired for something you didn't do; it means that you were fired for a reason prohibited by law. 2.) The above answer, whatever it is, assumes that no legally binding contract or CBA expressly says otherwise. If it does, the terms of the contract apply.