I'm not disagreeing with you. Just that being poor doesn't mean you have to be a failure, which is what the article may be insinuating. My father only had a sixth-grade education, his father died when my dad was born, and his mom died when he was barely a teen. Raised by his older brothers, dirt-poor and all working. They came out okay. Even though my dad had no formal education, he raised five kids. He didn't buy books except for a set of encyclopedias which us kids used extensively. I switched gears with my kids, reading extensively to them when they were young. They graduated with honors and went on to high-paid careers. I think it helped them in not being failures. You don't have to have an all consuming interest in helping them, but it may make a difference in how well they do in life in terms of their education.
Too many people want to believe having dedicated parents is the ultimate key to success for children, but my view is what's inside the child is far more important.