Coloured is a normal saying in South Africa and isn't an absurd politically correct euphemism for black. Before accusing others of racism, check your cultural imperialism.
I specifically did not accuse them of racism, I said that it sends a certain signal, which is obviously scoped to cultures. HN is largely about California culture, so many readers will have a US-centric reading. Understanding what effect the words you use has on your audience is important.
You'll also note that the South Africa bit is specifically mentioned in the "people of color" link.
You'll also note that the South Africa bit is specifically mentioned in the "people of color" link.