It's simply true.
https://fred.stlouisfed.org/series/WFRBSN40176
https://fred.stlouisfed.org/series/WFRBSN09149
https://fred.stlouisfed.org/series/WFRBS99T999259
There's more to say, of course. The role of housing, the role of the government, using DCFs for apples-to-apples comparisons of assets, jobs, social services, and the incentives thereof, behavioral economics, and so on. If you reflexively recoil at the notion that assets have returns, however, you aren't even at the starting line.
> mentioning passive income in this context isn't even idiotic, it's a clinical diagnosis
We could use the IRS term if you prefer: "unearned income"