I've never met anyone who's used Typst, I've only ever heard it on HN. And I meet a lot of researchers, teachers, and students.
Perhaps it's a programmer thing.
One reason is that many journals supply LaTeX templates. And I find them easier to apply compared to their Word templates. I wonder how much support Typst has from these publishers, considering its relatively young age.
Usage level is not correlated to "rate". Sometimes people use stuff because they have to, not only because they like it. See the Microsoft Word case.
I'd agree that LaTeX has fell a bit in popularity this days against Typst - but not much in its usage. It is still the de facto standard of scientific and technical document typesetting.