This is a simplification and misrepresentation of the argument.
It's not that orcs=black people. That's never been the issue. That's the misunderstanding of the issue that has gotten repeated very often as a counter argument, but, it's not what the issue is.
The issue is that the description of orcs directly (and very often word for word) mirrors the SAME LANGUAGE used to describe minorities in the very recent past. THAT LANGUAGE is the problem. The same way that we don't start quoting from Mein Kampf to describe things in the game. It's a really, really bad idea and carries with it far, far too many connotations and historical baggage.
Orcs=black people is a gross simplification of a much more complex and nuanced issue.
Any negative language we use to describe a creature will have, unfortunately, been used to describe a certain group of people, to make them non-human. Fear and dehumanization of the other has unfortunately always been with us and probably always will be.
I agree that some of the language should be fixed, but there will always be people who see correlations.