Warning: Unpopular opinion coming up
This is a ridiculous metric. They measure carbon emissions not just by what the billionaires are consuming, but by what their investments (businesses, factories, etc) are producing. This is akin to the world blaming China for their grossly inflated per capita emissions, while conveniently ignoring that it's actually being consumed by other countries and it's just shifting numbers around.
There are plenty of legit reasons to hate billionaires, there's really no need to be making up new questionable ones that can be torn apart.