The answer is simple. Cael has created his seasonal protocol in order to achieve his primary goal and that goal is as many NCAA championships as possible. He may care about the dual record, but only as a secondary achievement on his way to the career record of season championships. Isn't that what we would all want in his shoes? The Collegiate Duals interfere with his seasonal protocols, therefore he has no interest as he sees it as detrimental to his primary goal.
Once he gets criticized for not participating (I would love to see them in the event), he points out that the tournament can still be a great event without them, which is true. Even as a Penn State fan, I found the Nebraska vs. UNI, OSU vs. Iowa duals quite compelling.
My hope is that if the Collegiate Duals continue with a fixed date, Cael will adjust his seasonal plan to incorporate the event. I would love to see Penn State wrestlers wrestle 30+ matches a year. I would also love seeing my favorite running backs carry the ball 40 times a game and my favorite pitchers start 36 games a year like the old days, but I get it.