Hmm... I think one doth protest too much. At every moment something sacred is at stake. We are either living in the "house of Love" or we are living in the "house of fear."
(1) Nowhere does this article attribute that "every white teacher is inherently racist and prejudice." This article is a report of something that happened and ends with an example of how white teachers have successfully helped Black students, "As the parent of two black boys I know firsthand that white teachers can excel at teaching black children."
(2) Now, the fact that you would come up with such a blanket statement outcome that "every white teacher is inherently racist and prejudice" is either a lack of comprehension or you have allowed your personally experiences and beliefs to shape your comprehension of this article and have left your objectivity behind.
(3) When teaching, one of many things that needs to be considered is learning styles. Different cultures have different prevalent learning styles as well as culture have their own unique language (physical, written, and oral) references. For example in deaf culture certain colloquialisms may be misunderstood in interpretation. Say if you signed, "I have a run in my stockings." Your audience may just think where are your stockings going?! THIS HAS NOTHING TO DO WITH "LACK," only reference points. That's why when learning sign language in academia, one is required to engage deaf culture inside and outside of the classroom. AT THE SAME TIME, many white interpreters have a hard time interpreting in the Black church because of the unique rhythm and cultural terms and references of the preachers and speakers. So, if the interpreter doesn't understand how are they then suppose to help their deaf audience understand?
I shared the last point just as "food for thought" when considering some the obstacles your daughter may incur when teaching her students. Within diversity programs within school systems there are excellent programming that help teachers understand the cultures of their student body. Most times though, this available programming is not required for the teachers to engage and/or is not promoted as available to teachers. Also, this may help with engaging parents and coming up with solutions.
Just food for thought from someone who is very learned, high IQ, engaged parent, do for self and community person who is still impacted by racism and sexism individually and systematically and I can not "just forget," yet I do not need to carry a chip on my shoulder. I realize our humanity and our divinity. We are all birthed from love. Let's walk and relate in love and we'll be amazed at the outcomes.