Not at all, keto and low carb outperform them in many aspects of health. Pescetarian and vegetarian diets are also generally better than vegan diets. In some aspects they can not even compete against standard trash diets. Now that I think about it, I would place vegan diets pretty low if I had to rank diets, although not at the bottom.

Diabetes (duh), cognitive health, stroke risk, multiple sclerosis, gallstone risk, mitochondrial health, glucose-dependent cancers (brain, pancreatic, liver, breast, prostate), nutrient deficiencies are areas where I know low carb clearly has the upper hand. I am not aware of any health aspect where vegan diets would be definitely better, heart disease is a possibility, but unlikely based on what I know about its pathogenesis.

The main dietary reasons for the modern health pandemic are sugar, carbs, and processed oils. Low carb completely removes these and thus attacks the root cause. Vegan diets offer only a half-solution, they replace refined carbs with non-refined carbs, and remove otherwise harmless nutrients whose metabolism is negatively impacted by carbohydrates, such as sodium, fat, and protein. When you get to the bottom of the mechanisms and biochemistry, low carb makes much more sense than vegan diets.

The real reason we still get news like this is that vegans are politically active as fuck, and their diets coincide with grain industry interests. Nutrition science, if we can even call it science, is heavily distorted in their favor. Some sources of the bias and bad science: Ancel Keys, The Seventh-Day Adventist church, Richard Wrangham, the Willcox brothers, Denis Burkitt, T. Colin Campbell, Neil Barnard, Dean Ornish, Caldwell Esselstyn, Michael Greger, etcetera.