How does the percentage change when you look at people with full-time jobs? With full-time professional jobs? Who are actively trying to optimise their income instead of for example prioritising family? I'd guess it becomes much larger very quickly.
https://www2.census.gov/programs-surveys/cps/tables/pinc-01/...
In any case what you’re proposing is selection bias. No one should be surprised that people who work full time are more likely to make six figures than those who don’t. And yes, if you cherry pick a group of “professionals” who receive larger salaries of course the percentage will increase. And it’s back to survivorship bias for the “prioritization” examples you mentioned. Unless you happen to have a random sample of people who don’t make six figures but would prefer to.
Being willing to show up full time is necessary but not sufficient.
> According to the 2020 census data linked below the percentage increases to around 24% for individuals who worked full time all year.
It said and implied nothing about people trying or not. GP attempted to cast this as "1/4 of people succeed, so it's easily achieveable"
Also, if I look at the people around myself and see that 1 / 4 are able to do something, it would probably be easy. So it’s the GPs own self awareness combined with the stat.