I was giving you the definition of the word. Immortality means the ability to live forever - you can check it yourself with any dictionary or just use Google for it. If you can die, that means you don't have endless life. Thus, you don't have true immortality. Just because "literally any fictional universe" (that you read / watched, maybe) has immortality as longevity (unaging / ageless) doesn't make it true immortality. I, for one, have read plenty of stories in which immortality means you are both ageless and night-invulnerable instead of only one of the two.
You can see a list of different immortality types used in fictions here (click) for reference. Just because everything you read used a certain type, it doesn't change the meaning of *true* (absolute / complete) immortal.
Obviously that is not immortal. No one said you are immortal if you can die of old age. No offense, but do you understand what "virtually" means? It means "almost" - to save you the time looking it up. "Virtually immortal" means "almost immortal" / "nearly immortal". It's what it means, clearly not immortal, but close to.
And yes, we are virtually immortal in the eyes of the hamster if our lifespan is hundreds or thousands time longer than theirs (we aren't, though). Is that supposed to be wrong? Heck, even real life scientists are claiming we can be virtually immortal soon when our technology allows us to extend our life considerably or transfer our personality / memories into a backup device. Apparently people don't consider that term as stupid as you think it is.