They don't say it very clearly, but my interpretation of the document is that the author feels that the development of ncurses is misattributed/plagerised and wishes to use that as a basis for challenging the license. To what end, I have no idea.
According to the copyright on the document, the author started writing it about 15 years after the major events took place (and it is now 20 years later). My question is not so much why they wrote this, but why they waited 15 years to write this.
Probably because describing those facts is now a matter of historical research rather than a political statement. The future of the ncurses project is now guaranteed, there is nothing to risk (nor to gain) from reopening such old wounds looking for historical truth.
Note also that the copyright notice at the top of the page seems to imply this text was originally published in 2011 and then updated during the following 4 years.
I think it makes for an interesting forensic history honestly. Even with the authors perhaps somewhat biased account, its not as if anyone involved came out smelling totally like roses.
