I do also wonder what people consider modern. As I sit in my flat-roofed 1880’s Chicago home. Surrounding block after block of flat-roofed residential buildings housing millions of people, largely constructed between 1872 and 1930.

I find it hard to take seriously someone who is "suprised" by the existence of flat roofs in traditional North African/Mediterranean/Middle Eastern architecture.

Why? Do you feel humans should be born with a natural instinct for Mediterranean architecture, much as they are for the supremacy of iterative software development?

No, but if you criticize an architectural feature, maybe researching where it came from and what the reasoning behind it is can be expected.

I would expect a person who runs an architecture YouTube channel to be vaguely familiar with major styles of architecture, yes.