This exactly is the much more important second point Hickel is making. Even if growing GDP does mean tiny scraps of wealth are left to lower the number of the extremely poor[1], it's nowhere near resource efficient enough to be feasible within constraints of climate mitigation, biodiversity conservation, and resource depletion.

Pumping up GDP is not a sustainable way to reduce poverty. Gates and other people who benefit the most from the status quo continuing to advertise for this graph gives a very false sense of optimism.

1: $1.90/d is lower than the consumption level of slaves in the US in the 19th century. Helping people get slightly above the level of slaves is of course better than not doing that, but it is hardly enough.