I read through all his chatlogs, and this is the only instance that can be found where there's any racial slurs being used. While I feel that the term being used could've been interchanged with a more correct term and something less racist, this instance is a bit of a stretch to truly punish for.
I almost feel like this may have been a mistake and an oversight by the player at the time. This incident will be noted, and isn't significant enough to punish the player at this current moment.