That still doesn't make LoL an athletic sport (a sport that requires athletic capability), it just means some athletic people play LoL.
I'm athletic and I play chess, but chess is not an athletic sport.
ath·lete [ath-leet]
A person trained or gifted in exercises or contests involving physical agility, stamina, or strength; a participant in a sport, exercise, or game requiring physical skill.
http://dictionary.reference.com/browse/athlete?s=t