Most “unskilled labor” is heavily skill dependant. You wouldn’t want a chef, builder or plumber who didn’t know what they were doing. And for production: machinists, mechanics and foremen make or break profit with their skills.
So what’s a better name for these jobs?
Trades? Tradesperson. We use unskilled labour to describe things like sales reps, wait staff, and janitors because the list of jobs you used all require post-secondary education.