even the link you posted... the host factually states nitrogen has value. after all, it is used in indy and nascar, mandatory in commercial airplanes, as well as nasa and military applications. plus, SCA even has nitro registered and it is ISO verified...
at the end of the video, (after explaining that the place he filled it at , it must not have been 100%) he said "it will keep your tires inflated longer", but "i don't think i'd recommend it".
he is saying the same thing i am... it has some value.. not nearly what some dealers charge, but it is something value added... also, most dealers that include nitro in the tires also include a 2 year "tire guard" road hazard warranty with it... that includes fixes on slow leaks or replaces tires due to blow-outs or sidewall damage.
you keep trying to go all black and white, but there is a grey area that provides a usable product, peace of mind and a bit more profit for dealers. (emphasis on *bit*... trying to fleece old ladies still isn't my thing).
oh, and i have had one claim go through with etching! the customer got 4 grand on top of his insurance payout to buy a truck off me... i'd say he was happy! it is a rare one to get used, but it does. i think if it as really cheap (limited) gap insurance.