Chinese magic schools turn out dozens of women as magicians, but their performances tend to be mechanical and not all that impressive.
I've seen some female performers who performed stage magic and some close-up. I won't name any names, but I was very disappointed with their presentations. One of them was so bad that she unintentionally gave away three important magical secrets due to her flashing (i.e., inadvertently showing the secret) and awful misdirection.
I've heard it said that there is a distinct advantage in some forms of magic to being white. Perhaps this remark was directed to magical props that are "flesh colored." Or perhaps it was intended to mean that a dark-skinned performer is less visible or recognizable in the low light that is important to some tricks. Or perhaps it was intended to express the preference of many audiences for a white performer. I don't know.
That said, I no of no good reason why there cannot be more superb performers of color, or why there cannot be more superb female performers. (Of course, I say the same thing about electrical engineers. From kindergarden on, I was in classes--except certain gym classes--that had a balance of the sexes and people of different races. But when I started attending electrical engineering classes, that changed. Many of the classes were exclusively male, and except for a few Asians, all white. As best I could tell, there was no good reason for this near uniformity.)