Ghost of Animes
I will say I think they're being perhaps optimistic with regards to the crossover between the anime fanbase and the Archer/It's Always Sunny fanbases. Of the people I know in real life who watch Archer and It's Always Sunny, I can't see them going for anime. I doubt they've been introduced to it, so maybe I'm wrong, but I just don't see happening.
I've watched every episode of It's Always Sunny multiple times. Andrew watches it. I wouldn't be so sure that there's no crossover appeal; there's evidence right here that there is.