That's not "a bit more". That's insane.
And there's absolutely nothing disingenuous about it, because the article clearly states:
> the average investment emissions of 50 of the world’s richest billionaires are around 340 times their emissions from private jets and superyachts combined.
> Through these investments, billionaires have huge influence over some of the world’s biggest corporations and are driving us over the edge of climate disaster.
... I don't know why this isn't convincing to you, but it's not Oxfam's fault.