The claim sounded outlandish, but Scala looks indeed to be around the top 10~20 languages in hiring for instance:

https://www.devjobsscanner.com/blog/top-8-most-demanded-prog...

Scala is only in 0.5% of the scanned job offerings, and is far far behind the major languages in numbers, but I was surprised there's more demand than Rust or even Perl to be honest.