Take a look at "China: Consumption-based accounting: how do emissions compare when we adjust for trade?"
> Annual consumption-based emissions are domestic emissions adjusted for trade. If a country imports goods the CO₂ emissions needed to produce such goods are added to its domestic emissions; if it exports goods then this is subtracted.
2018 had 8.96 bn carbon tons in consumption out of a totla of 9.96 bn total tons (~90% consumption)
The biggest amount of greenhouse gasses that china emits is from coal power plants. Naturally, figuring out what amount of electricity was used in the production of the exported goods is basically impossible, which is why its considered consumption in their data.
I'm sure the spirit of it is still correct (that most of their co2 emissions are for internal products/usage), but its hard to take that conclusion at face value when they didn't even mention the caveat that they ignore the by far biggest contributor of their emissions and consider it consumption by default.