Since this has gotten to the point where we need to be precise with the language: they are not the tools for eliminating the existence of bias. They are tools for countering the effect of bias in particular instances.
I think you missed your parent's point. Let's examine a related case: fashion models. The industry has been manipulating images for years, to make models skinnier, whiter, removing blemishes, etc. In your language, these are tools for eliminating the effect of bias for the models. The impact that's had on our society is well studied: biases have been disastrously reinforced.
