It’s not racism until it is-proven with something said or some way to validate. Some parents are really, really pushy. My youngest kid in grammar school wasn’t in the pull out section of advanced math. When I asked the teacher why, she said other parents had pushed really hard and there were only two spots. My kid skipped a grade in math, went on to win multiple national math awards and started Calc as a 9th grader. Never got less than 100 on a math test ever. Often rewrote the problems to solve in different ways. Those other kids, not so much. No race factor, just parent factor. And BTW, the teacher pulled out a folder about 3 inches thick with all the JOhns Hopkins Math challenges my kid had done when those other kids were at " advanced" math.
Have your Dad focus on the results not race. Getting into the class is what matters. And ask why it wasn’t done the first time.