2-6% global GDP probably means 20% of all western country’s GDP paying for the rest of the world while China paints their rocks green to fool their own gov inspectors.
The site you are pointing to does not use accumulated past emissions to judge countries so is highly dubious from a developing country perspective.
But again, I think pointing to others is a straw man in the debate. Each country need to go ahead and shoulder their share. For a country such as Germany the estimates point to 2.5% of GDP per year to be spend over the next 27 years to achieve a net zero economy. This is an effort that is so miniscule that it is embarrassing. And it is mostly domestically spend money to build wind mills and install PVs. The component cost is becoming less and less of a share.
I think China is well aware that their country is one that is very negatively affected by climate change. The continental climate will turn China into a desert if climate change isn't reduced.
The cost trajectories are so much in favor of renewables that spending money to build them is starting to make even financial sense.
(P.s.: My low effort google was an answer to a bullshit Youtube channel)
https://youtu.be/AynNsPs9i80