Indeed. "Evolution" would imply that humans with bigger jaws were somehow disadvantaged and died before they could pass on their genes. Really bad article.
I don't have an opinion on whether the subject is a case of gene selection or gene expression, but your binary caricature of evolution is misleading. A trait can be weened from the gene pool simply because it costs energy without providing a benefit, causing those with that trait to underperform compared to those without it. Even if individuals are living and passing on their genes, a trait might fade from the gene pool over time because competitors are able to claim a bigger proportion of resources, reproducing quicker and more often.
The human appendix is like that: it isn't directly harmful, but it's shrunk simply because it's a waste of energy.
The point is the trait hasn’t been lost at all. If people with this problem had a kid and fed them hard foods from the get go then, supposedly, they would grow the larger jaw and not have the problem with cramped teeth.
