It's very important to understand that these are not isolate incidents, they are happening every day.
You're getting your desire to make fun of SJWs confused with your understanding of what you've read in this case.
Because the argument you've linked to isn't saying "classical studies is racist" it's saying "racists use a warped and poor understanding of classical societies to justify their racism, and classical scholars should argue against that". For example, in this very quote from your link.
It is time for Classics as a discipline to say to these men: we will not give you more fodder for your ludicrous theory that white men are morally and intellectually superior to all other races and genders. We do not support your myopic vision of “Western Civilization.” Your version of antiquity is shallow, poorly contextualized, and unnuanced. When you use the classics to support your hateful ideas, we will push back by exposing just how weak your understanding is, how much you have invested in something about which you know so little.
It's like how there are a bunch of Neo-Nazis who call themselves Odin-14 or Thor-88 online, because they understand Norse societies as a hardcore whites-only rape filled golden age that Europe should be sent back to, and the fact that Norse societies weren't like that (eg, rape was an outlaw-worthy crime, Norse society was welcoming to Arabic traders and explorers like Ahmad ibn Fadlan, among other groups) isn't going to get in the way of their justifications.
While I'm at it
And why there should be any surprise that a central figure in the English language is, after all, ethnically English... again, no clue.
I know what you're getting at, but black people have been living in Britain since the time of Emperor Hadrian at least, because roman soldiers and merchants were sent/came over from the entire empire to wherever there was trouble (eg Ivory Bangle Lady of York). So while Shakespeare probably wasn't black, it has to be mentioned that the idea that everyone in Europe was white until the modern era is a worryingly common inaccuracy of the type that Neo-Nazi groups love pushing to justify their white nationalist politics.