Well, according to my Nepalese Hindu husband, it is not cannibalism.
As to your other question, I believe that cannabalism is now frowned upon in not only the modern world but most remote places as well, the Fore having given up cannibalism after a nasty stretch of kuru deaths.
Well, since ritualistic cannibalism persists here in the West, in the form of Christianity (the wine and the wafer), I sure wouldn’t get too worked up about a ritual involving ingesting some ashes. Carbon and calcium, just like fortified bread, skipping the beverage.