You are comparing a country that was probably less than 5% of China's current population during that peak. And not only is China 17.5% of the world's population, it is also the major manufacturing hub for the majority of the world. 10 times as much coal as the UK's peak is still a tiny number.

The reality is that China is emitting much less CO2 per capita than the US or Canada, and just a bit more than the more industrious EU countries like Germany. And this is territorial emissions: if you take into account what percentage of those emissions is going into goods produced in China but bought by those very countries, it's probably around the EU average if not lower.

Is China anywhere near a net 0 goal? No, not even close. But among industrial powers, it is one of the ones that went by far the most into green power.