This is fallacious logic. Being a biological human being isn't dependant on being able to suffer, being able to perceive sense data, or being able to interpret sense data. Being a biological human being is dependant on having the genetic makeup of a biological human being.
Besides that, per your logic and reasoning, we'd have to be off killing people on life support or in comas. Medically induced comas, even.
"What's that? Jerry was hit by a truck and he'll be put into a medically induced coma but he's still got a 99% chance of survival? Brilliant! Let's kill the bastard because he has no capacity to interpret sense data and as such is no longer a fucking human being. I can't wait to be inheriting his money like."