The definition relates to the day of hire. The seeking of new employees. Not the state of those employees after x amount of time working.

Some of the boxes here are too simplistic.

Being a mason, a brick layer, is skilled. But to hire a new person to the crew is unskilled. All they do is carry things, and clean up.

Experienced masons take years to develop, and sometimes include professional certification and education. That’s skilled labor.