when it comes to nutrition, much depends on how things are worded.
The RD is absolutely right that you cannot prescribe diets. Nutrition software, on the other hand, is there for anybody to use who wants to use it.
I have used such software in the past to show to clients imbalances in their diet. We are on the right side of the argument when we stay in generic terms and point out to clients, for example, how much carbs, protein and fat should be in a healthy diet.
It is a murky field.