Ian & Tom,
Not only can it be published elsewhere in a day, but in the following second. What is published in the "In My Opinion" section are akin to editorials or OpeEd pieces in newspapers. There are no copyrights attached and neither Ran nor the website own the copyright to the article or the information contained therein by the simple act of publishing it.
This can be seen in the "submittal" guidelines. They are, "All essays are saved and a library is created to which everyone has full access. No editing is performed, so this feature can be a place to speak one's mind in great detail without fear of having the published result edited into a watered down version. However, as with the site, the articles are meant to be constructive in nature - mean spirited articles will not be published. Controversial ones will but please note: GolfClubAtlas may or may not share the views that are expressed in these articles."
Note there is no mention of forfeiture of rights as would be required if copyright to it was being claimed.
So, if Ran publ,ishes it, the piece still belongs to the author...