"Mr. Big" and "Head Honcho" are euphemisms for "the person who is actually in charge", or the boss.

"Director" and "Showrunner" are job titles you'd have on your resume. In the case of the showrunner, they're directly involved in day to day stuff. I've heard interviews in which showrunners say their job involves making 500 snap decisions every day: "which fabric swatch should we use? is it worth an extra $80k to film in this location?" that kind of thing. I guess the software equivalent would be a product manager? In Kathleen Kennedy's case, as head of Lucasfilm, she's making big decisions on everything, but likely not micromanaging individual decisions. So, she'd be the CTO or equivalent.

Showrunner isn't a job title though. Most likely the actual title on the resume would most likely be "Executive Producer".

Showrunner is definitely job. It's something you put on your resume.

'Executive Producer' is just a credit, it doesn't mean anything really. A powerful actor participating in a film, might get an exec prod. credit, not for doing anything at all.

He’s putting those in quotes because they’re generally not formal positions that are explicitly credited, but are informal phrases referring to whoever has final creative control over a series.

That sounds like it's all a bit made up then...

Showrunners are a thing. See eg https://www.youtube.com/results?search_query=hollywood+repor... for some stories from the trenches.

It’s not. See https://en.m.wikipedia.org/wiki/Showrunner

So these are real terms then...