At around the 7:07 point in the video, John answered two important questions. They are,
Can a single page with extremely high engagement and traffic influence the domain as a whole?
Do these signals trickle to other pages on the site and play a positive role at that domain level?
John Mueller responded that Google doesn’t support leverage engagement as a factor. He also added, “So I don’t believe we will user engagement as a search ranking factor.”
Then he spoke about checking if the queries that generate engagement are relevant. He stated that “the aspect I’ll be looking out for is whether it generates engagement in the type of things that you care about.” John talked about a case where we see a website might be ranking high on SERPs for specific queries, but after examining the query, we realize that we are ranking for the queries we never intended.
John also mentioned the entire site could affect other parts of the website. He stated, “But it’s true that most pages on the website are interlinked to other pages of the same website. Through these internal links, they forward some signals. Therefore, if we determine that a page is an excellent page and we’d like to display it in search, and it has a variety of external links linked to it, then that provides us with lots of context regarding the page. We forward some of it to the other pages on the site.