Why do they continue to publish articles literally stating the same facts, word for word, from those old, published position statements?

The science hasn't changed. In fact, it's only supported plant-based diets over the years.

If you talk to a registered dietitian today, they will say the same thing. At least, that's been my experience through working with several over the years.

Either way, it doesn't particularly matter to me. I've been vegan for over two decades and my doctor is quite happy with my health.