Yes, because they learnt it somewhere, for example, this article.
I don't get the negativity. Unless you work on bleeding edge R&D, every technique you know has been documented somewhere by someone else. So only the bleeding edge R&D people should write tech blogs?
Anecdotally, even I had known what texture compression is, this article still taught me something: the existence of Tacant View. It looks like quite a neat app.