i have never heard it and i find it offensive.
to say that something is of long-standing does not make it ok.
the original title of an agatha christie book now called,
'and then there were none', used a highly offensive term.
that term was of long-standing, didn't make it right.
i took the view that the original so=called mythical person was an oversight. it is not a term i recognise nor find acceptable.
but the response being a claimed justification was even more offensive, so that suggests to me that the writer is not willing to examine the terms used, and the assumptions behind them, and doesn't care about giving offence. so if that is not racist, call it something else, some other category of offensive.