This last objection by a dietitian (Dietitians Weigh in on the Low Carb/Ketogenic Diet) actually has some merit but it’s not really all that important since it emphasizes weight loss and not glycemic control.
…though ketogenic diets [sic: short term] were found to produce the greatest weight loss compared to other diets, in the long term there was no difference
This is not really an objection to the ketogenic diet. If it’s more effective short term and no less effective long term then what’s the problem? Most people would love to have a short term loss particularly if it didn’t cause a long term problem.
The issue is compliance and the ketogenic diet is easier to stick with long term since it is more satisfying.