I get the point you're making - but honestly I have to raise the counter argument, which I think is equally valid. Take for example, the average lecture video. The information density is so low, that I'd imagine that a 60 minute video could be compressed into 10-12 minutes without any loss of information. It really depends on what you're listening to/watching.
I use the same youtube plugin mentioned in the article, and watch many videos at 2.5x-3.0x speed, for the exact reason that you state. There is a lot of "filler" content that I either a) already know or b) is not relevant to what I'm trying to learn. I'm really just trying to get through that content quickly. When I get to some really dense portion though, I will turn the speed down to 1x to learn it.
This lets you skip filler content automatically for many popular videos.