Well, it was you who wanted to specify three possible arguments, and you who claimed that others were making argument #1, and you who then failed to support that claim, except by saying that it's you who feels that the "like a human" bit follows from what has been said. It's a hole of your own digging.
So no, you aren't "pointing out" anything. But you can have a "take", and the idea that Data should age like a human based on that single claim is fine as such. It can then follow that this idea is contradicted elsewhere (Data thinks he might live for centuries); that the idea is actually supported elsewhere (Data's aging is a program, and he has a history with those); or that the idea doesn't affect anything much (it only emerges after Data has speculated on the upcoming centuries).
Fundamentally, though, Data isn't Tainer. He isn't being misled into thinking that he is human, or even that he is about to become a human. Soong is playing different games with him, from beyond the supposed grave. So the "like Tainer" angle is a bit weak IMHO; "Inheritance" is all about Data and his mother being in rather fundamentally different jams, even if they share some hardware and software design.
(What to make of LaForge's line, really?
"It's part of her aging programme. Not only does she age in appearance like Data, her vital signs change too."
Does this mean that Data's vital signs change, or that they do not? Nobody has ever mistaken Data for having human vital signs as far as we can tell, but naturally we can't tell all. Yet in the context, the thing is that Tainer is unlike Data, and surprises Riker. So the natural way to read that would be to say that both change appearance, but only Tainer's vital signs change - and that only Tainer's aging program thus is of any relevance to Tainer's longevity and possible mortality.)
Timo Saloniemi