I think even though Python in the industry like in web isn't growing as much as say Node, in other places like Data Science and Intro to programming in Unis and Schools Python is growing very fast.

The article is not narrow minded but has a narrow focus and only analyses concrete data from a single source. It may be globally accurate but indicates a rising trend in people being interested in python. While Python usage cannot be directly correlatd to SO, we can infer that languages that have more questions have more people using or learning it generally. In the same way languages with a small community of users don't always prefer SO but something more personal like Mailing lists or IRC (eg. J language).

It should be safe to conclude that due to Data Science being the new buzz word and python at the forefront of it all, atleast python is getting a lot of attention even if it doesn't translate directly to more users right away.