Appears that he was invited. Maybe he's filming something for one of his skits. Who knows.
Either way, it's irrevelvant. I've seen Kenny Chesney in a Bama hat and a Gators jersey and helmet. We just saw Shane Gillis sing Rocky Top at Neyland and he's a huge ND fan. When you are invited to somewhere like this, you are often gifted apparel. And if you take pictures, they want you taking pictures while wearing their gear. It's a simple as that.
As far as taking a picture with Nico, who knows. But it's really not worth thinking too much about. If I were famous, I would gladly take a picture with Nico or Henry T if they wanted me to take a picture with them. Because I can separate my feelings as a fan with my feelings as a regular human being.