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I think this is an unnecessarily polarized admonition. Alcohol is arguably more than possibly-lethal, but many people exercise a reasonable risk calculus that allows them to enjoy it, and even enjoy it to a low level to moderate excess (on occasion), and that doesn't necessarily indicate pathological drug abuse. An unusual medically-safe (in medical contexts) anesthetic generating curiosity about recreational effects…
It's a heavier-than-air asphyxiant and the contexts are not medical. It takes somewhat rose-tinted glasses to assume every person abusing this anesthetic will do so safely, under professional supervision, in some expensive clinic. Or that the anesthetic spas will be competently regulated and ethical.
Inert gas asphyxiation is instant death.