Well, given that there are two different sports called football, it helps to have an easy way to distinguish them, for clarity's sake.
Is it in any way germane to the story or something which could not be gleaned from the link I posted? Seriously, this OCD-level need you have to show the extent of your knowledge to all and sundry is totally embarrassing. Do you think anyone reading the post really thought this might be a soccer match?
Anyway, if one must be pedantic there are 4 types of football I can think of. Haven't you heard of rugby or Gaelic football?