The primary problem with this claim as it usually presented is that it tends to ignore that earlier generations did not go from kindergarten to home ownership in a year: you grow up with your parents' generation's condition as "normal" when it actually represents 30-50 years of "accumulation".

So yeah, 10 years ago, very, very few millenials owned a home. But that was true for 23 year old boomers too.

You can look at that data too.

https://www.forbes.com/sites/katherinehamilton/2023/04/21/ge...

Millennials own less homes than boomers did at their age. Though based upon the data Gen Z is possibly turning things around.