The only people I know who have profoundly cluttered homes filled with much more stuff than average had war or famine/poverty as a part of their personal history.
I'm sure this doesn't account for all cases and my sample isn't representative.
When I notice the extra items in the homes of hoarders I know, they're nothing that I haven't or wouldn't have acquired in one way or another -- they're things I would've thrown away.
I see no evidence in the article that a possible increase in (more likely recognition of) hoarding is a result of increased consumption and yet that connection is implied in the article again and again.