The original article is an opinionated rant. It’s not a scientific or a philosophical treatise, so bringing up things like how diabetes is being cured is far, far outside of the subject matter. So for me this retort is invalid from the get go.
The crux of the original article can be summed up as: “I don’t want to be lorded over by morons who pay their way to live to 200 years.” Hard to argue with that.
In particular I’m amused by this line from the original article:
> I am not looking forward to living in such a world, and indeed I think that such a world might constitute an immense disaster for humankind.
I’d argue the world/humankind is already an immense disaster and things can’t get much worse in any real way. It’s run by sadists and we don’t even know why we are here.