It's true, to a first approximation. Rich people look at money as a goal in itself. They collect it, hoard it, curate it, maintain it. Think of a library, or the biggest MTG card collection you know of. Now imagine that same mindset applied to money. Not money-doing-things, just money, sitting there, "on the books", but otherwise just a collection of amounts.
Now picture the worst episode of "Hoarders", and imagine all that weird obsessiveness and attachment to the thing.
That's a pretty big assumption