This is just one of many examples of the totally unrealistic investment info in this article.

$15k puts you near the poverty level for most anywhere in the US. US poverty income levels are also notoriously low (meaning you are very, very poor even if you earn considerably above the poverty level).

2000 hrs is full-time employment.

$15000 / 2000 hrs = $7.50/hr. Anyone working in the US knows you cannot survive on $7.50/hr.

I could go on for a while detailing how this is fantasy math.