If studying is genetic, isn't it natural that Seoul and the 8th School District perform well?

I heard that the proportion of students from Seoul and the metropolitan area entering SKY universities is increasing.
In the past,
talented students were likely distributed evenly across the country,
but isn't it possible that those talented individuals moved to Seoul to study and settle down,
and since most of them reside in Seoul,
their sons and daughters
are now entering prestigious universities in large numbers?
In this era where online lectures are well-established,
rather than the gap widening
because of academies in Daechi-dong,
isn't it just that the concentration of "study genes" in the metropolitan area
is intensifying?
Isn't the reason children in Gangnam, Seocho, and Mok-dong perform well
because many of their parents are professionals?
In Seocho, it's crawling with legal professionals and Seoul National University professors...