It’s on their weird about page

“The crazy thing is, despite all this, people still want kids. The economy and social challenges—are the real culprits for the drop in birth rates, not a shift in attitudes. Countries with austerity measures, like the US, UK, Germany, Italy, and Greece, have lower birth rates than Denmark and France.”

It seems to me that they are using population decline to go after austerity and NIMBYs

Long term, yes, great for the planet. But shorter term, a shrinking pool of working aged adults are going to have to care for a growing pool of elderly. Additionally, the overall economy is going to contact before the age cohort imbalance takes care of itself. Same thing is happening across most of the developed world, but it's happening faster in China, and they're less developed to start with.

Liberals believe in infinite growth, and for that to happen you also need infinite demographic growth to get an ever increasing work force and mass of consumers.

They are just a bunch of weirdos.