I was being sarcastic when I asked that, we all know how reciprocals work. The answer to the question you're ducking and dodging is the productivity gain needed to offset 1% decrease in population is 1.01%. That's it, the difference is 0.01%.The equation is (1/(1-x/100) - 1) * 100, where x is the percent decrease of the population.
Simplifying for TFR effect, the working age population is expected to decrease 43% every generation with a TFR of 1.2. This corresponds to a need to increase productivity by 75% to maintain the same GDP output. That was easy for China to do back when it was industrializing; it's much harder to do now.
As for your South Korea fixation, I don't know how many ways to tell you that a failure like South Korea has nothing to do with China. It is a tiny statelet colonized and dominated by the US. Almost a third of South Koreans in Korea are Christian, what more does one need to say about the level of mental colonization than that? South Korea has no government, just a handful of giant conglomerates running the "country" like their own private plantation. Stop comparing it to China.
You're also far from the only one who's figured out that China's TFR is low and needs to go up. The government's figured it out as well, which means it's going to go up.
What are they going to do, vote? The Chinese government is not going to make decisions based on popularity. If the population doesn't like a decision needed to safeguard China and its advancement, tough. They didn't like the lockdowns, but they were forced down their throat because it was necessary at the time.Not going to sit well with the population after you've been limiting them to 1 child for 30 years.
Just like the 1CP was necessary 30 years ago. That was then, this is now.