I think they're bringing it up because cats are indeed the #1 killer of birds, and so for people who care about maintaining bird populations (presumably people who read this article) it would be better to focus on solutions that decrease the damage cats to do birds, rather than the damage wind turbines + oil-and-gas plants do to birds.

Of course, if you care about birds you're going to try to solve it across multiple fronts. But cat damage should be the first thing bird-lovers try to mitigate.