I think you're misreading the OP. While it was stated that you wouldn't be immortal, inasmuch as accidents or other violent events could still kill you, I think the clear implication was that it was about significantly extending your lifespan, not just maintaining a youthful appearance. I didn't see any "refusal" to refer to them as people, just not using the term in that particular sentence. Do you always see it as dehumanising any time a person is referred to as anything other than "a person".? I mean... I'd guess it was you being antagonistic and insulting. I don't think it's hard to work out.