I don't know how true that is nowadays.
There was a time when no one other than black men wanted to date black women for a variety of reasons. However, that has changed. Men of other races are more open to dating black women, and plenty of black women have abandoned that loyalty they claimed they had and are jumping at the chance to date outside of their race.
I don't really care about that to be honest. What I do find annoying is that they can't just admit they are happy to have a wider set of options and want to explore those options now. Instead, they basically try and claim that they have no choice but to date outside their race because black men are insufficient in so many ways.