Just because some guy put MOBA on the list doesn't mean it is. Yes it has roots in the RTS genre because DOTA(which has roots in the starcraft map Aeon of Strife) started out as a map for Warcraft3, but League is not an RTS. It's like Heavy Metal and Rock and Roll. Does Metal have roots in Rock? Yes. Is metal rock? No. Is rock metal? No.
League has a level-up progression system, so does that make it an RPG? Do you crawl through dungeons, carry out quests, battle a final boss, and have the game world change through your actions? Nope. There is a reason why games like Aos, Dota, and League are refered to as MOBAs or Hero Defense and not RTS's or RPGS. They simply lack all of the qualities of an RTS or RPG to fit into those genres and that is why they are in their own genre.
I still remember that League of Legends being declared a sport bullstuff too.