You know no one died of it since 1920? Or died of it alone?
For all intents and purposes it's gone.
Hangook, The Spanish Flu was a variant of H1N1, which is a subtype of Influenza A, which kills thousands of people every year.
It is very possible that the great great great great great etc granddaddy of the Influenza A virus that will kill some random old guy today was a viral particle of the Spanish Flu. Evidence for this is the observed fact that they share the same antigenetics.
Viruses continuously *evolve*. Is the recombinant Deltacron the same virus as the original SARS-CoV-2 viral particle? Most would argue yes. But continue through with the various iterations of variants, and then it becomes a bit harder to say. One can firmly say that yes, "A" is a descendant of "B", but are they the same virus? A may be B, or maybe A may not be B.

Deltacron and Delta (the former a recombinant of the latter) are both covid19, which is a SARS virus. If Deltacron kills some poor elderly guy, was it SARS? Yes, certainly. Was it covid? Yep. Was it Delta? Well... sort of?
Replace Deltacron with Swine flu, Delta with Spanish flu, covid with H1N1, and SARS with Influenza A, and it's exactly the same story.
Did the Spanish flu kill a bunch of people in 2015? Well... sort of. The argument could be made either way.
Epidemiology is not a simple thing. Few things ever are.
