I haven't read your link, but the first thing that I thought of was that this was a set up to negate any influence that O'Reilly might have on the election and ruin his career. The woman left FOX, went to CNN and then came back. My guess was that she came back to get O'Reilly on tape and may have actually lured him into the kind of remarks that she wanted him to make.
The timing of this is suspicious.