It states that his behavior is typical of a person with Parkinson's disease. Of course, this is in response to what Rush Limbaugh said on his radio broadcast where he stated that Fox either stopped taking medication to control the Parkinson's (which, by the bye, would still emphasis his point as the medication merely treats the symptoms) or was acting.
The article does mention the accusation by Limbaugh but it oddly doesn't ever say his name:
Was he exaggerating, as one radio commentator suggested?
Here I was going to give Fox News credit for defending the integrity of Michael J. Fox. Even a simple search on Google reveals the name of the "radio commentator."