This is completely false because people like to ignore the fact that there are worldwide recognized definitions for this.

Unskilled workers does not mean you don't learn a skill. It means you don't have specialized training required to do it.

We've had the concept of skilled laborers for ages. The words artisan or journeyman have represented it for ages.

The reason unskilled labor jobs make less is because it's easier to replace the person. Wages are entirely based on the value you provide vs the difficulty of finding someone who can do your work.

We see this in the exact market this thread was about. At the height of the pandemic when companies were hiring like crazy expecting massive growth they paid up to 500 to 600k in some cases with sign on bonuses etc. Now that the market is completely flooded with people looking for jobs and there's not enough hiring going on the salaries being given out are significantly less in many cases (often like 250k to 300k instead).