There is a flaw in their method.

Take for example Santa Fe, New Mexico. I expected the most Wikipediaed person would be George R. R. Martin.

Instead, it's Murray Gell-Mann.

Odd. I mean, yes, famous physicist, coiner of 'quark', etc. But, c'mon, compared to George R. R. Martin?

Then go to https://en.wikipedia.org/wiki/Category:People_from_Santa_Fe,... . While Gell-Mann is on that page, there are also seven subcategories.

  - Actors from Santa Fe, New Mexico‎ (2 C, 16 P)
  - Archbishops of Santa Fe‎ (12 P)
  - Artists from Santa Fe, New Mexico‎ (78 P)
  - Musicians from Santa Fe, New Mexico‎ (16 P)
  - Politicians from Santa Fe, New Mexico‎ (1 C, 26 P)
  - Sportspeople from Santa Fe, New Mexico‎ (11 P)
  - Writers from Santa Fe, New Mexico‎

GRRM is in that last subcategory.

However, it appears to be an uncommon pattern. I tried another 15 or so cities and none of them used subcategories.