I don't think he should have been trained or advised on the terminology that's acceptable to use in reference to black people. It wouldn't make any difference. They tell us which words they find acceptable, so we start to use those words, then they immediately change their minds and decide those words are now racist.
They have one agenda. Whitey bashing. Give it time and they'll start complaining that white people 'taking the knee' is patronising and therefore racist. They won't be happy until Caucasians are extinct.