Without reading the article, I'm pretty sure it's because that's what they have to pay to get decent drivers.
This one seems to have missed the memo, and only gets there briefly once or twice, but the title does not in any way imply an information-free article.
Maybe fewer road incidents, reducing liability? Like, maybe people who can provide for and spend time with their family have 11.3% fewer crashes?
(Edit: number was made up, hypothesis purely speculative.)
The biggest determining factor on a driver is their safety record and if you can manage to not hit anything (you're not aiming for) over a long enough time period it is quite possible to get the good jobs.
[0] https://safer.fmcsa.dot.gov/query.asp?searchtype=ANY&query_t...