I don't think people would be saying Elm is dead if there were regular bug fix patches coming out and we were on v0.19.21. The reason why people are declaring Elm dead isn't because new features haven't been added in two and a half years, it's because there hasn't been a bug fix update in two and a half years.
Sure, the language is stable in that it doesn't change, but stable can also mean bug-free, and Elm is certainly not stable enough to justify going that long without a single bug fix.