Meh, people misspeaking about a game isn't a big deal. Saying someone shouldn't talk about a game unless they are "experts" at it is the same idiocy super fans others when they say anything less than "its perfect!" about their favorite game.
Or another way to look it, if the only time the GB Staff should ever talk about LoL is "from expert authority" then everyone must live with the fact it will never be mentioned.
Side note: Brad is by no means an expert on Dota 2 and it is no a big deal to misspeak on details and mechanics.