It is not just this news article (posted by
@Fuzball) about 'Pyramid Girl' actually being the 'Liberian Girl' song.
'Pyramid Girl' was the working title of 'Liberian Girl', as confirmed also by several other sources.
For example:
"
…'Liberian Girl' came out of the woodwork in 1986, under the working title 'Pyramid Girl'…" ('Michael Jackson: All The Songs: The Story Behind Every Track' book by François Allard and Richard Lecocq)
Even Adrian Grant confirms it in the March 1987 news section of his book:
"
…The ['BAD'] album is said to include tracks titled 'Bad' and 'Pyramid Girl', later confirmed to be 'Liberian Girl'…" ('Michael Jackson: The Visual Documentary' book)
Or, the 'For The Record' book (by Craig Halstead and Chris Cadman), which again confirms that.