I don't think that's the paragraph you're looking for to make your point.
He said plumbers would start in the low $30-an-hour range but would earn low-$40s when they were experienced.
Apprentices would start on minimum wage but progress fairly quickly towards $30 an hour.
Yeah, I'm a software developer, and in the past when my time was billable it was billed somewhere between 3-4x what my total compensation was. I get that they need to make money off me but that was a quick disillusionment when I learned what the variance was