Whether that claim is accurate or not can be judged on data, no? Out of curiosity I googled "graduate high school, maintain employment, and don't have children out of wedlock" and this is the first result:

> Let politicians, (...) and parents drill into children the message that in a free society, they enter adulthood with three major responsibilities: at least finish high school, get a full-time job and wait until age 21 to get married and have children. Our research shows that of American adults who followed these three simple rules, only about 2 percent are in poverty and nearly 75 percent have joined the middle class (defined as earning around $55,000 or more per year). There are surely influences other than these principles at play, but following them guides a young adult away from poverty and toward the middle class. [0]

It's not saying anyone can get rich. It's not saying poor people are lazy. It's saying these 3 things will have a major, measurable impact on your future and your children's.

[0] https://www.brookings.edu/opinions/three-simple-rules-poor-t...