Did you get this list of 15 languages from TIOBE's July 2019 top 15 rankings at https://www.tiobe.com/tiobe-index/ ? It also says Apache Groovy has risen from #81 in July 2018 to #15 today. I do believe the #81 ranking but the rise to #15 only 12 months later is ludicrous. Someone's obviously spamming a search engine to get that ranking up. I know someone does the same thing with Groovy downloads from Bintray.
Now if Groovy's ranking has been fabricated over the past year, then surely some others of those languages have also been similarly fabricated for much longer, and their popularity has been exaggerated.