Of course not, they're simply pointing out how the title is misleading. Obviously more people being able to feel comfortable enough to come out is a good thing, but that doesn't change the number of gay people in the world.
Probably could have chosen different terminology but "grows" doesn't necessarily mean more people became gay, it could just mean that more people openly identified that way.
I wasn’t gay. But then I turned 60 and wanted to be hip again so I joined the internet to see what todays youngsters were up to. I saw that they’re all gay furries now so I figured I’d better get with times. It’s been very itchy and sometimes painful but at least I’m hip now.