Any student in any group or activity, or not, can do NIL.Row the Boat!!
Seriously, it would be nice if he got the U fishing team more recognition. Good luck to him. He'll get it. Would be awesome if he got NIL sponsors for the team if allowed in club sports. Don't see why not.
You just have to find some company that is willing to pay you money for the right to use your name, image, and/or likeness in some promotional material/campaign it wants to put out.
Anyone can technically do that ...