That doesn't mean that an individual black woman is unattractive or doesn't get hit on. Women respond and maneuver subconsciously to their relative status, as part of some group.
Discussion
Many black women are unusually attractive... and yes I've been insulted for having that opinion
Black women traditionally have had a really hard time on dating sites. (I assume this hasn't changed all that much)
And, like I said, women respond to relative status.
So, if a black women gets 10 men writing them on a dating site, and she knows women of other races are averaging 15, she will be humbled.
She still has plenty of opportunity, but she won't FEEL like she does.