This is either disingenuous or ignorant of reality.
Yes. Your Econ 101 class may have taught you jobs will shift. Econ 101 does not give you the case study of a 45 year old worker who finds themselves having to restart their career.
So yes, across many years a shift in employment happens.
To the guy who lost his job and now has to figure out what to do, he risks being unable to find a career anywhere near where he was at.
Ideally we would have retraining programs that would meaningfully train and place people into new jobs, but efforts are largely performative.