Hell, just this youtuber is a good example of what you are saying. This guy, 'DistroTube', has a ton of entry level videos about seemingly niche linux topics. Even the video you posted has a little command line tutorial embedded into it.
I come across him whenever I am trying to figure out what a specific distro or tool _looks and feels_ like. If you search any distro name plus "distrotube" there is probably a video of him setting it up and playing around with it.
I have wondered about this guys background before and finally looked it up tonight.
> Despite the geekiness of my content, I have never actually worked in IT or a computer-related industry. Although Linux and technology have always been my hobby, I worked in the retail industry until recently. In 2020, with the pandemic and the subsequent shutdown, I lost the job that I had at the time. The retailer that I worked for went bankrupt and cut most of their supervisory positions (including mine). Thankfully, I already had a side job of sorts—making YouTube videos! So since the pandemic started, my full-time job has been making video content.
> I have been strictly a Linux user since 2008. The distro that I currently run is ArcoLinux with the xmonad window manager. Some of the software that I use daily includes GIMP (for graphics), Kdenlive (video editing), Audacity (audio editing), and OBS (for recording/streaming video). I also use a distribution of Emacs called Doom Emacs. It is my preferred text editor, although I often use Vim as well, especially if I am already in a terminal.
from https://people.zsa.io/derek-taylor/
Which still leaves a lot of mystery to the "how did he get into this" question.