Stew did have Gary Giuffre on ... and it's also possible that he saw Brother Nathanael becoming Catholic. Before he interviewed Brother Nathanael, Peters had always referred to "the Zionists", and Brother rebuked him by telling him to have the courage to call out the Jews (when that is what was mean, rather than Goyish Zionists). Since then, Peters has been on a tear against the Jews.
Now, the one I wonder about is Jeff Rense. When he has Fr? Kramer on the show, Rense continutes to make statements that show enough knowledge of and insight into the Catholic faith that it couldn't have been acquired by research from a secular perspective, where he almost sounds like he could be a Traditional Catholic.