Yes, they do. But usually not for Kurzsegagt.
Kurzgesagt, here, is an example of professional content without much, if any, fluff.
Contrary to lots of content, professional or lot, which relies on artificially increasing it’s without adding any value. For these videos, people often share the timestamps at which the desired information can be found.
People do that? Especially with Kurzgesagt, I can't remember a portion of their videos I've found to be valueless.