I‘m out of the loop: we‘ve had Python, Clojure and possibly something else recently. Is that a series by the same people working through several languages? Is it happenstance? Is it a trend, and every programming language is now scrambling to get their own video documentary?

Yes, these are the same people: https://www.cultrepo.com/

Apparently, they are making documentaries about open source software.

That‘s cool, since it establishes a brand. If one was done well, the others probably are, too, so even if it‘s not your language of choice, it will be interesting.