Another illustration: All of the following are equivalent labels that can be used to refer to you:
"untermensche"
"the person posting as untermensche at talkfreethought.org"
"untermensche@TFT"
"untermensche, child of <your mothers name> and <your father's name>"
"untermensche, child of <your mother's name> (daughter of <your maternal grandmother's name> and <your maternal grandfather's name>) and <your father's name> (son of <your paternal grandmother's name> and <your paternal grandfather's name>)"
The last can be trivially expanded by including your great-grandparents, and their parents, etc. So there trivially exists a label for you that explicates your genealogy back 32 generations, roughly 1000 years. Pronouncing that label at one second per parent-child relation takes 2 ^ 32 seconds, or 136 years, longer than any human has ever lived. There even exists a label for you that explicates your genealogy back 64 generations, roughly 2000 years. Pronouncing that label would take roughly 40 times the estimated time since the big bang.
By the logic that let's you conclude that the number referred to by 0.(9) "doesn't have a final value" because there exists a label that cannot be actualised, I herewith derive that you don't have a final value, aka don't really exist.
It's either that, or your logic is flawed.