Github Can Never Support Kernel Development

a really odd way of using Git

Git was literally designed for kernel development.

That jumped out to me too. Seems incredible that the reason the system exists at all, has become a "weird" way to use it. You can git clone the kernel just like any other repo on github, so no big deal.
Git is nog te same as github. Linus Torvalds usage git as he created it to manage the kernel development but has also criticized how github operates.
PS didn't watch the video yet will do tomorrow.
- I didn't even mention Github, I just quoted from the video description.

Link is to a video of a guy reading somebody else's blog? I guess that's "content"...

Linus is using git the way he designed git to work... it's a distributed source control system. Kernel development has always been about having lots and lots of "forks" which coordinate around a central "base."

Was also designed to be accommodating of very diverse flows, like people living on remote islands with spotty internet connections, or people hacking on the kernel on long airplane trips without any connection, or people sending patches by email, or kernel maintainers acting as clearing houses for branches etc.
The famous "git flow" is only a tiny use case of what git is capable of, and Github (and other similar platforms) are mostly designed around those limitations and have otherwise very limited support for other flows.