Well the Playlists in Retroarch don't matter to this to scenario, they have no impact on Launchbox working at all.
But that still doesn't help us out here. If your games are loading using the Load Core > Load Content method it should be working through Launchbox.
The only thing that I can think of at this point is that because you have a special character in your emulator path, the first folder I assume is your name and the "a" has an accent on it.
I really am only guessing at that though but it's the only thing that is what I would call out of the ordinary at this point. Everything else appears to be correctly setup.