I can't help but think that there's more to that situation than EA is telling us.
We can still earn coins and unlock the DLC without paying a cent on the 360 (yes, it's more work than on the PS3 version, but the course mastery objectives aren't that overly difficult), so how is that any different from Microsoft's point of view than us being able to earn enough coins to just unlock it outright?
Either way, Microsoft isn't seeing any money so I don't get why they will supposedly allow one but not the other.
I could understand why they would maybe require EA to sell the courses on the Marketplace instead of just with in game coins like they do on PS3, but the rest seems pretty strange to me.