I think you may have read too much into their Viggo's comments.

After having watched both interviews, I got the impression that Viggo made a joke about Michael because the joke in the email he sent to Michael never got through. Michael mentioned something about an email.

In all, the joke seemed like a playful jab and nothing more. Plus I'm pretty sure Viggo knew Michael would be on the show a couple days later to react so it was the perfect set-up.