I seem to remember that Fernandes or Beard had a chat with him and then jumped the gun in public about the stadium when nothing had been agreed. Mendes has had the hump ever since, understandably, because whenever a stadium is mentioned it is on the assumption that a chunk of Cargiant land will be used. Now it must be impossible to get the land from him without paying a ludicrous amount of cash and they would still need to get the stadium included in the overall development plan.
So yes, amateur hour.