I see your point. Perhaps the writer of the editorial meant "the world [of mankind]," meaning everything in the world's civilizations is less than 6,000 years old?
Nice JW-style interpretation there. (You even got the brackets!) What were you Fred Franz in a previous life?
The author clearly made a pretty basic mistake. Why make a weak attempt to deny the obvious?
I'm not saying I blame him all that much for getting it wrong. There must be plenty of people "brought up in the truth" who leave as soon as they can with little care for getting JW doctrines correct while they're making for the exit.
But if I was a Witness reading that article, that one basic error about the age of the "world" would give me more than the justification I would be looking for to dismiss it as lacking credibility.
True, JWs believe that the earth and the universe can be millions of years old. But, the traditional understanding of the WTBTS is that all animals date to within 20,000 years ago, during the 5th "creative day." Not too many scientists would hold that as verifiable either.
Of course scientists don't agree with the Witnesses either. Clearly I am not saying the Witness teaching is right. That was not my point.