This is normally called “institutional knowledge” which is definitely a real thing, I don’t think it’s a marketing or HR buzzword. Though, a lot of the time it somewhat trivial things those things do add up. Institutional knowledge around things like how to deal with a finicky piece of specialized hardware, or what are the right words to convince your bosses boss to pay for you to go to a conference are pretty helpful. If you have an older “individual contributor” in your company that has been there for a while and hasn’t climbed the ladder, they might be a gold mine for that kinda info (they could also just be an ass)