“Please don't add any of my stuff to this project”
Seems like an author that doesn't understand the spirit of FOSS.  The nixos team was clearly allowed to use it and include it when asking for some technical merits as to why, and even offering many alternative options to appease the author the author seemed to just childishly stamp their feet and say, "because I said so".  Eventually the author took the position of "taking my ball and going home".  Why is a person like this even engaged in FOSS if they don't have a desire to share or even engage in a reasoned discussion?