A lot of Elixir Q&A actually happens on https://elixirforum.com/ and the slack channel https://elixir-lang.slack.com/ . So stackoverflow trends may not be the best thing to judge this.
This isn't to say that I wouldn't use SO for other purposes, as I actively visit the site for JS/PHP content. Anecdotal evidence to support your insight by all means, of course.
"Go to the Slack channel" is not really an acceptable substitute for that level of independence in research.