They put it there to see what kind of internet disturbence it would create. Probably not enough so they removed it.
Actually no one has any idea why they put it there.
Possibly it is on the books and was listed prematurely. Or maybe the web admin thought if they were doing WoW then Diablo is on the cards too. Or perhaps even it was a joke because everyone knows how people on the internet love a good conspiracy.
An accident... kinda like IGN's accidental Diablo III banner at E3, having it on the banner might be an accident, making it go bold... no accident, something major is happening at the LP site, when they had diablo on their You could click on everything and it had a description, except for diablo, its possible that it was an accident, but im doubting that.
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If you ever meet a hafling and a hungry dragon you dont have to outrun the dragon, you only have to outrun the hafling.