It’s an authoritarian state. They could actually just effectively mandate that each woman has to have two kids if medically possible.
I've kind of been down this thread a bit and I think heavy taxes on birth control might be the intervention that a pro-natalist authoritarian government might go for. Reading the article, it does sound like China is trying to tweak these levers. But at the end of the day, if you don't have a society that women are interested in raising children in, then I think it's just going to be very difficult.
We can't forget that the only reason we're in this mess is because of the success of the one child policy, but could the CCP replicate this success when it comes to nudging families to have even more burdens? I don't think so.