I'm not familiar enough with Keating's apologetics to know who he's refering to.
He's probably going to go after Gerry Matatics. He's been hounding the man trying to destroy him after Gerry stopped working for him years ago. They had a disagreement over finances. (basically one didn't want to pay the other what he'd agreed to)
Gerry has since become a traditionalist Catholic and that spells trouble for the other guy.