And there you have it from the horses mouth, he apologises to the people who have (deliberately misunderstood his words) and explains what should be clear to all who can actually read without strongly tinted glasses, that he did not intend racial bigotry.
If he does get fired and takes it to court he should by normal judicial practice win easy. This should never have been more than his superior having a talk with him about trying to be more careful in his choice of words when he writes to the papers.