I just did a Google search on "Nibi-Nibi" and its AI came up with wrong answers.
I then did a Google search on "Nibi-Nibi" shortwave.
FINALLY got the right answer on The SWLing Post...so...for those of you trying to figure out the Rep. of Nibi-Nibi reference, this one is the correct information.

"Source was “Short-Wave Report” by Hank Bennett, Popular Electronics, Ziff-Davis Publishing Co., New York, p. 86, March 1959."

Image of Popular Electronics announcement; text :
Nibi-Nibi Islands
"A few months ago there appeared in the bulletins of various clubs and organizations an item about a new station located in the Nibi-Nibi Islands. Additional reports on this station have been received from time to time, with the latest report containing information on new programming.
The National Geographic Society claims that there is no such island. And investigation into the situation by several veteran DX'ers has failed to locate the original source of the information. It is believed now that the entire episode was a hoax. While it may have begun as a harmless prank, it has, nevertheless, consumed the time and efforts of the editors of many clubs, organizations, and DX programs.
This sort of thing has no place in short-wave listening. It is sincerely hoped that all DX'ers will be on the lookout for such obviously phony reporting and will do all they can to discourage any repetition of this kind"