I disagree. I think it has more to do with ear training and being familiar with the topics at hand. I listen to most spoken videos on 1.5x by default and can easily go to 2x for channels with hosts that speak slower. This is most noticeable for podcast-esque content that is more free-flowing and unscripted. In those scenarios, I might start out at 2x but slow it down if the podcast hosts/guests get into a passionate argument about a topic and start speaking faster and faster.
Importantly, for topics that I don't understand (learning a new language - Dutch), I often don't speed up those videos because my brain is working a helluva lot harder to keep up. This changed last week however, when I was watching some very basic A1 content and found myself wanting to speed it up just a little bit. Did it help that the presenter was speaking slow and enunciating? Yes, but it's nowhere near the most important deciding factor (imo).
To be fair, a lot of content on a podcast-like format is like 5 minutes of ideas stretched out to 115 minutes because that's what podcasts typically boil down to. Doesn't matter if you miss out on some detail because there's just not much subtlety to anything shaped up like a podcast. You can walk away from it for 5 minutes and come back and often you'll not feel like you've lost any information.
You'd probably miss out on quite a lot more if you played a Platonic dialogue back at 2x speed.
