A London Hawk wrote:" off the field the man inside the costume has a passion towards fighting Multiple Sclerosis (MS) after being diagnosed with it four years ago"
The article seems clear that's the guy inside the costume that suffers from MS. Why his name wasn't used I don't know, could of been for any of a number of reasons.
Rarely are mascots mentioned by name so they can have a life. Very common even in college ranks to keep those names on the quiet. In colleges its known well around the campus but I think you'll find most pro sports with a mascot keep the name private.
San Diego Chicken a classic example. Until long after a big time lawsuit between Chick and the ball team no one knew his name. It took a court fight for him to go out on his own cause the ball team decided it was their deal and it turned out the guy got the idea and sold the team on the idea of letting him try it out.
But that's another story