I agree absolutely with it. Somebody who is trying to get rich by all available means will not getting rich anyway because s(he) will do to much mistakes.
The things about getting rich is, those who chase money don't always get it, it's better to start finding projects and work which has potential and most importantly what you love doing, money follows sooner or later.
This is another one of those phrases for the masses. Sounds smart, but actually isn't.
You won't get good at swimming by cooking.
You won't get good at piano by skydiving.
The point is, the best way to get good at something is to directly do that thing, and not through some roundabout way. If your goal is money, then you should directly work towards that. If you don't achieve it like this, you'll certainly not achieve it through some roundabout wishy washy "do what you love to do" kind of mentality.