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Yes, they (also from the Japanese site) were removed altogether.In 2005, the "1001" articles were published as a book. I suspect that the later articles will also be published as a book, and that's why the "free" articles were removed.
The optimist side of me might tell that Nikon website would be under thorough reconstruction to celebrate the 100th anniversary, and thus 1001 might be temporarily removed.
it will easily be back at the 1001th anniversary