The only thing I could find was potentially a 7-0 match for Turkey vs. Korea in the 1954 World Cup, which was played in Switzerland? Hard to say, since the data seems to come from:

http://www.world-results.net/

and is a paywalled API.

Perhaps this includes qualifying matches.

The only World Cup qualifier that I could find (going back to 1990) are the play-off games between Turkey and Switzerland in '06. Switzerland wins the first game 2-0, and Turkey wins the second one 4-2.

Nothing as dramatic as a 7-0 margin as suggested by the article's data though.