American Samoa, for instance, was entirely unscathed by the Spanish flu because they instituted a strict quarantine at the border, the same policy Australia/NZ did for Covid-19.
See this pre-covid article from 2018, for instance.[0] Sound familiar?
> “These communities basically shut themselves down,” explains Howard Markel, an epidemiological historian at the University of Michigan who was one of the authors of the study. “No one came in and no one came out. Schools were closed and there were no public gatherings. We came up with the term ‘protective sequestration’, where a defined and healthy group of people are shielded from the risk of infection from outsiders.”
[0] https://www.bbc.com/future/article/20181023-the-places-that-...
For more than a year any counter of the narrative would get vitriol and the same talking points in a very political/religious zealot way