Yes, it's how medical conditions can be diagnosed. Having a poo isn't a medical condition. You stated that Naylor has written about a player's medical condition, when actually he hasn't.
Well, this is a bit funny for me as I was known for having 3 or 4 poos on a match day. I didn't feel particularly nervous, but I'd have 1 before leaving home, then often 2 or 3 in the club toilets. Exactly as described, just 3 or 4 ordinary poos. Became a bit of a running joke that the manager...