Kosian is the word not politically correct?

I came across the article below trying to find out how this blog stand from among the web/blogsites. This link was taken from the Marmot Hole's Blog.

We’re ‘Koreans,’ not ‘Kosians’: multicultural families

http://www.rjkoehler.com/2006/02/23/were-koreans-not-kosians-multicultural-families/

This entry was written by Robert Koehler, posted on February 23, 2006 at 2:21 pm,

So my question : is the word Kosian then not politically correct?

Readers it is up for you to decide