The researchers mentioned in this article were generally measuring empathetic, selfless, or compassionate behaviour, and the effect of wealth (or perceived wealth) on that. So “human” in the sense of “humane”.
The beginning of the article started with the implicit assumption that one can learn anything at all about "rich people" from watching a couple of folks play a rigged game of MONOPOLY.
It didn't get any more academically rigorous, so I attributed its rise in HN to being link-bait and decided I had more important things to do with my day like getting rich so I can become inhumane.