You must have misunderstood, because those are excellent reasons to get a pet first. If you can't afford the time, attention, and money to raise a dog then how could you expect to raise a human child?
Human living conditions are well suited to supporting children (human living conditions are designed for humans after all) – other animals like dogs, not so much.
Financial viability is improved with children (they start to contribute once you get past the first few years) – other animals like dogs, not so much.
Existing time and attention focuses can much more easily integrate children (like dining out? Bring your children!) – other animals like dogs, not so much.