ENFB was the old Fornebu airport which closed in 1998, however the code now belongs to an oil rig located in the ocean between Norway and Scotland.
The coordinates are N61°12’23” E001°49’44” or N61.206389 E1.828888889.
I've mailed this to ourairports.com as well, I found threads from 2018 where you mentioned them as your source.
Thanks