There was an other subreddit where they posted the same graph but someone had an explanation about what MAY be contributing to this figure in comments:
- You may know something called TATA Class Edge. My school had a projector with this loaded on it. It’s basically a A/V format for education. It has videos, games, MCQ quiz etc. Apparently they load Ubuntu on it these days. And they are present in many schools apparently. Well, the ones we had were Win 7 ones
- Then another reason was something the guy personally did. He said he helped three of his friends install Linux on their old machines and almost had a fourth one too
I cannot find the link to this subreddit tho 
SORRY NO NEWS HERE!