David, I don't believe anyone asked him that. The first half of the presentation was about his background with the Secret Service and what he did leading up to Dallas. Robenalt was with him and assisting. I don't think there were any "hard hitting" type of questions. I might be making a mistake with my memory... Landis said that when he finally wanted to bring out to public his recollections he reached out to an unnamed Secret Service contact. This person, who knew of the Wecht Institute/Cyril involvement, reached out to the president of Duquesne (who the agent knew) who then connected with Robenalt. Someone will certainly correct me if I'm wrong.
What I can say David, is it's not too late to get some clarification. I recommend you reach out to Robenalt immediatly.