The article shows this referenced professor uses the same type of reasoning used to "find" bias in police arrests -- that because the gifted/arrested distribution differs from the local populace, racial bias must be taking place.
Her arguments boil down to this:
1) The tests used to find gifted kids are culturally biased. (Without explaining what this means.)
2) Teacher recommendations are also used, and teachers are racially biased. (Without giving the racial composition of the teachers.)
3) The parents of rich kids can afford coaching not available to the poorer ones. (Without presenting any data on how prevalent this may be.)
Guess it never occurs to her that reality might be taking place?