It is certainly worth looking into, though it doesn't seem that there is much that is special, as there are other single incision type lap techniques that are touted, and extensive pre-op diets, liquid or otherwise, are not a standard thing - I never did anything other than the usual day before thing. VSGs are sometimes done outpatient with the standard techniques - it's more of a concern of verifying that all of the inside part is working correctly than the incisions healing, and the endoscopic aspect is a normal part of a VSG procedure as that is where they insert the bougie that they use for guiding the stomach cut.
It overall sounds like they are applying a proprietary name to some fairly routine techniques as a means of setting themselves apart from the crowd. There is another guy in TX that promotes a "special" sleeve (inverted, maybe?) that is little more than an oversewn staple line that is, or was, a fairly standard procedure.
It mostly sounds like marketing more than anything overly innovative; I would really verify results and complication rates as results matter a lot more than what techniques are used to get them.