Going by the definition in the referenced link,

“a statement of your experience with or knowledge of inclusion, diversity, equity, and belonging efforts and your plans for incorporating them into your teaching, research, mentoring, and service.”

it doesn't seem outrageous- it does force the writer to think about their past experiences and observations in regards to inclusion, diversity, and equity... which makes the author of this opinion piece feel this way, and this seems the reaction has more to do with their perception and personal view of (and disagreement with) the prioritization of these concepts than it has to do with the requirement itself.