Yet among the 6.3 billion who live in the world’s remaining 136 countries, the opposite is the case – with 70% of people feeling positively towards China and 66% towards Russia.

Or in other words, the majority of the world supports Russia.

Sure, for what it's worth I could concede that a global majority might approve of support for Ukraine according to this data. Looking at raw data from: https://www.allianceofdemocracies.org/initiatives/the-copenhagen-democracy-summit/dpi-2023/

That figure may not be accurate however, especially because I can't see that they computed a weighted global total by population. They extrapolate to obtain each "nationally representative result" by taking into account the respondents' age, gender and education to mitigate selection bias. I have my doubts about extrapolating like that, but okay. The main problem is when you check the global total, it's just an unweighted average of all nations. Highlighted in orange: Top - unweighted average of all nations, Bottom - reported figure from the author

Each country has ~1000 respondents, so there isn't a proportional representation of each country based on its population - small countries (mostly imperial core, as it happens) have an outsized effect on the average.