That's what I thought too at first but the journal instructions have it covered:
"At least one stub article (essentially an extended abstract) for the paper should be added to either an author's userspace at Wikipedia (preferred route) or added directly to the main Wikipedia space (be sure to add literature references to avoid speedy deletion)."
This is actually an old idea from early in Wikipedia's history:
"It was hoped that scientists would sometimes drop by wikipedia, and start a stub or short article on something they had researched, prior to it being accepted in a peer reviewed journal. This would allowed a scientist to prove that they discovered something first."
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[ 6.8 ms ] story [ 49.7 ms ] thread"At least one stub article (essentially an extended abstract) for the paper should be added to either an author's userspace at Wikipedia (preferred route) or added directly to the main Wikipedia space (be sure to add literature references to avoid speedy deletion)."
"It was hoped that scientists would sometimes drop by wikipedia, and start a stub or short article on something they had researched, prior to it being accepted in a peer reviewed journal. This would allowed a scientist to prove that they discovered something first."
http://en.wikipedia.org/wiki/User:Kim_Bruning/Lost_functiona...
As that page also notes, the very strict interpretation of "No original research" of the modern Wikipedia community makes this very difficult.
Even pages in userspace pushing what is deemed OR are liable to get deleted, though not nearly as much as in articlespace.