I cannot seem to find any research relating to these 8 benefits. Maybe you could post a link as a reply. I did however find many research articles stating that a gluten-free diet can be nutritionally deficient. Many gluten free foods are supplemented with higher salt, sugar or fat. I cannot put it any better than a paper I came across so I wont try, I shall quote the paper instead:

From the paper: Gluten free diet and nutrient deficiencies: A review

Results
GF-diet was found to be poor in alimentary fiber due in particular to the necessary avoidance of several kinds of foods naturally rich in fiber (i.e. grain) and the low content of fiber of GF product that are usually made with starches and/or refined flours. Micronutrients are also found to be poor, in particular Vit. D, Vit. B12 and folate, in addition to some minerals such as iron, zinc, magnesium and calcium. Moreover, an inadequate macronutrient intake was reported related above all to the focus on the avoidance of gluten that often leaving back the importance of nutritional quality of the choice. In particular, it was found a higher content of both saturated and hydrogenated fatty acids and an increase in the glycemic index and glycemic load of the meal.

Conclusions
Despite the GF-diet is necessary in celiac disease treatment and the attention is on gluten avoidance, the evaluation of nutritional quality of the diet must be considered. Moreover, educational strategies based on the relationship between nutrients and food and human health could be developed to optimize the therapeutic approach in celiac patients.

ref: http://www.clinicalnutritionjournal.com/article/S0261-5614(16)30088-7/abstract