Most of what's written in this article is deliberately biased and wrong. It is yet another in the stream of Scala-hating posts that people. I analyze the article below:
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TIOBE index is a metric based on search engine ranking policies and can be intentionally or unintentionally gamed.
https://blog.timbunce.org/2009/05/17/tiobe-index-is-being-gamed/
On these rankings, Scala is quite high: