Makes a lot of sense to me if you look at the examples, and think of all the wacky things people will try to do with video because they think they know that branding means "stick the logo in the video somewhere".
It's adding consistency to the presentation and harmonizing with any accompanying non-motion graphic styles, as you might see in a cultural presentation environment with both packaging/signage and video or interactive elements for example.
I did and, in my opinion, they are far too generic to offer any semblance of value in terms of video composition. I'm no expert though, so maybe a videographer can chime in - but it feels slightly pedantic.
They're not telling you how to compose a video. They're giving you something to compare with as you compose your video. Too many other details will emerge, so it's a guideline and not a how-to.
And, later, those guidelines give a designer an institutionally-bought-in way to talk to someone without talking down to them. Refer to the guideline and discuss the guideline, not "I'm right, you're wrong." It's not meant as purely a technical spec as it may be interpreted by more tech-oriented mindsets IOW.
It's adding consistency to the presentation and harmonizing with any accompanying non-motion graphic styles, as you might see in a cultural presentation environment with both packaging/signage and video or interactive elements for example.