This guy is correct.
There is similiar things in SEO, which is more or less a google ecosystem, just like youtube is, you can bet that similar principles apply.
In SEO, if you check the content from the top listing competitors, youll usually see a H2 question replied within a "p" element, the ones who reply the questions with the least amount of chars and word, rank best.
For the visual products, we see this materializing by many folks youtube feed having sensationalist thumb images and video titles.
Your definition of better content might differ from the viewers definition, remember, 50% of the folks out there are dumber than average

You might have deeper content, but people usually learn the gritty nitty parts of topic on a job or educational facility, Youtube caters mostly to low attention span, instant gratification clientele.
Journalist also have this pyramid or inversed pyramid principle on how to grab as many peoples attention as possible and then take it from there.