:The info box is a tennis player's info box.  The countries in tennis player info boxes are the country the player represents in tennis competitions, in this case the Great Britain Davis Cup team.  The descriptions in the lead are the agreed consensus that best informs the reader where he is from, and best reflects what Murray has said himself.  If you wish to decide that is a declaration of "nationality" then that's up to you, but it is not an attempt to declare anything beyond describing Murray.   So no, there is no inconsistency.