No. Metaphorically if the person gave the other permission then it's permission. I read about the case I think you are talking about. He only got 8.5 years (later received life) because in Germany cannibalism isn't entirely illegal.. the lawyers said it was a mercy killing because the guy wanted to willingly die. He was suffering from abandonment issues and depression but also always had a fantasy of being eaten. It isn't like he just found anyone on the street.. they talked for months.
While most wouldn't choose this way to end their life.. I think it goes along the same question of is "assisted suicide" morally wrong I mean in the context of these cases. Which I find no it isn't but rather the opposite.. empathetic.
Humans are hard wired (all humans) to have selective empathy. This presents a paradox as far as human rights is concerned. I also think this explains why we can have selective outrage as well.
