Let's be clear, this diagram and the shared presentation is talking about Information Architecture. Most of which has been gleaned from the 1998 O'Reilly Book, Information Architecture by Rosenfeld & Morville. https://intertwingled.org/the-polar-bear-book/ If there was a designers bible for digital design, the "Polar Bear" book would be it.

The term UX has been around for a very long time. Its just back in the day, UX was a more holistic concept, described more as a shared responsibility of many people, not a specific person or role.

So could you use the diagram the OP shared today? Absolutely. Those techniques for defining design have been around for a very long time (many developed in the 60's and coming from the HCI field), maybe some of the terms have changed.

For more on this I would suggest checking out Jesse James Garrett's diagram and book on the Elements of UX http://www.jjg.net/elements/ A lot of the terms and roles we use today came from here.