I have not got a degree in equine nutrition - come to it I do not have a degree in any nutrition but looking at her picture and her qualifications I would say that all her knowledge is theoretical and that she has had little experience in actually working with a large stable of horses that all have different feeding needs.
I am old enough to have been taught feeding regimes that did not consist of mixes and prepared feeds designed by nutritionalists. I have tried them as it made life easier but, soon disliked the results and returned to 'straights'
More telling is dry dog and cat foods - again designed by the modern nutritionalists, majority, not all, are totally incorrect for our pets. Experience has told me this.
I feed my dogs raw meat and that only. My dogs have all made an average age of 13 years, this was lowered with one dog I took on that had lymphatic cancer and died at three years and another rescue that also had cancer and was only four years. The oldest was 18.5 years.