Students at "a prestigious London university" are wanting him and Kant stripped out of the philosophy curriculum, which makes about as much sense as structuring a math program without addition or algebra. The claim is that they are "white," but there's no way Plato would have seen the sense of that characterization. Leaving aside that we don't know that much about his pigmentation, it's not a category he would have recognized. He'd have said that he was an Athenian, and if you wanted something broader than that, a Greek.
You want to put him in a category with a German? Germans were literally barbarians to the ancient Greeks.
Roger Scruton charitably said that the demands suggested "ignorance." Truly: not only are they too ignorant of philosophy to know the value of what they are throwing away, they're too ignorant of history to know why their demands make no sense.