I thought the same as you when I read the article, OP.
If you don't want children for ANY reason, that is absolutely fine and great and 100% a valid choice. But then, why pretend that you would like them but can't afford them?
What's the point of that? It's like me claiming that I don't go to see football matches because of the cost of tickets, travelling difficulties, fears about hooliganism and drunks etc. - rather than just being honest and saying that the game bores me solid, so I have no interest in going whatsoever.
If you like/want something, go right out there for it; but if you're not interested, for whatever reason, just say that.