I think it's pretty clear. Except in the dramatically unlikely case that the racial quotas are precisely tuned to have no effect at all, then having racial quotas necessarily means that more qualified applicants of one race are rejected in favor of less qualified applicants of another race, explicitly because of their race. If you're in a jurisdiction in which this is illegal (such as the U.S.) then racial quotas or preferences are illegal. Why no one else seems to realize this is illegal (as well as immoral) is beyond me.

Edit: Downvotes are nice, but refutations are better.