As Juno78 points out, Sports Law is a perfectly proper subject. Would you all be saying the same if,for example, he did property law or contract law? What if he did aviation law - presumably you'd all recognise that as a 'real' subject and not "puff".
How ON EARTH can anyone have the Academic ability experience or gravitas to be a Professor of anything at that tender age???
He isn't, he's a lecturer. North Americans often translate this as 'professor' which is what they call even junior academic staff who we would call a lecturer in the UK system (they use "college professor")