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).