Right, so the "where" is the USA.

If we take this definition of the generations and table 12 from here, we can compare the values 16 years apart to see generations at equivalent ages. 2023 is the most recent data on that table, so millennials would be 27 to 42. We can't match that perfectly with the 5 year bins on the table, so I'll just average every bin that that generation covers a majority of. With that, we get:

We can compare generations at the same age by looking along the topleft-bottomright diagonal. This shows gen Z having a lower ownership rate than Millennials did 16 years ago. Millennials were doing better than gen X 16 years before that, but have now fallen behind both gen X and the boomers.

Sure enough, the entirety of the discussion of homeownership in the article you linked is:

American Zoomers’ home-ownership rates are higher than millennials’ at the same age (even if they are lower than previous generations’).

Not sure what data they're using since that doesn't tally with the above, but that's still second-worst, and the actual worst is the generation the post is actually talking about.