I've head the displeasure of working with more than one Elm zealot in the past, and also allowed a service to make it into production (which was a huge disaster). Due to that, I know a lot more about Elm than I'd like to.

I think the "Elm is stable not dead" seen from the few people that stuck around with Elm is largely cope for being stuck with an unmaintained language. Languages, like all other pieces of software need maintenance or they degrade in the world moving around it (e.g. there is/was no official aarch64 build of Elm in the period of non-maintenance).

I also would say that Elm is still largely unfit for most realistic production scenarios, unless you have the manpower to build everything from scratch, as interoperability with the outside web world (JS/TS) is an afterthough, and by some parts of the community not desired.