The article talks about reductions in extreme poverty, that is living on less than $1.25 a day. Note that doesn't really address wealth disparity, only that more people, esp. in China, are living with higher income.

However, this change doesn't make any statements about increasing equality for different economic classes nor does it talk about sustainability of a lowering extreme poverty rate. It also doesn't talk about various aspects about living just above that extreme poverty line or the challenge facing those people not living in places like China that have seen a big economic boom and are not likely to.