Which category is supposed to relate to their previous reports? They used to have 4 languages (C, C++, C#, Java) between 50 and 99, now there are none. It appea

Which category is supposed to relate to their previous reports? They used to have 4 languages (C, C++, C#, Java) between 50 and 99, now there are none. It appears their algorithm has changed. They mention change in the article but all the change appears to have happened in the past two years. They describe Trending as zeitgeist but what does that mean?