No, it's a selection effect. The stackoverflow most loved metric is
people_who_want_to_keep_using_the_language / people_who_have_used_it_in_the_past_year
Since Rust is so early in its adoption and there are few jobs, many of the responders are hobbyists who are into Rust, like it and want to keep using; not necessarily people who use it for work. And since you only take into account the people who have used it in the past year, you ignore all the people who have tried Rust before that and didn't like it.
As an extreme example, let's say I created a language in 2020, the entire software community tried it and they absolutely hated it and unanimously rejected it as the worst language ever but it still has 2 users (my mom and I) who want to keep using it - that languages would score 100% Most Loved on stackoverflow's survey even though it was hated by the overwhelming majority of people who tried it.
With this formulation you create the strange effect that if people hate a language enough to stop using it, the language's most loved metric goes up after a year.
As an extreme example, let's say I created a language in 2020, the entire software community tried it and they absolutely hated it and unanimously rejected it as the worst language ever but it still has 2 users (my mom and I) who want to keep using it - that languages would score 100% Most Loved on stackoverflow's survey even though it was hated by the overwhelming majority of people who tried it.
With this formulation you create the strange effect that if people hate a language enough to stop using it, the language's most loved metric goes up after a year.