Knowing Unix is not the same as knowing to use a program which only exists on one version of Unix, and which was not distributed with the OS, and which was less helpful at file system exploration than both the 2d file manager [1] and 1970s-based Unix shell tools [2].
You specifically called out "older people even working in IT", which includes me. Just because you want to jeer at people who don't know what you know doesn't mean there aren't other reasons to jeer at the same scene.
[1] Here's what the IRIX 2D file browser looked like in 1990: https://www.youtube.com/watch?app=desktop&v=IRB2MkMxgy0
[2] On a related note, The Great CHI ’97 Browse-Off was a non-rigorous head-to-head contest between different hierarchical browsers. The Hyperbolic Browser was the clear winner, with Windows Explorer coming in second, and the DOS command-line doing pretty well until it came to comparison questions like "Which planet is also the name of a car brand?" where both categories in the ontology needed to be compared.
