It'd be great to see the article.

I hope you answer my burning questions: Is pre- vs post- just a way to distinguish the sub-threshold exposure from deliberate graying exposure? Does it matter if the total flash exposure occurs at any combination of before, during or after enlarger exposure? My gut tells me it doesn't matter and conventionally we do this because it is easier to figure out what amount of flash is desired by keeping the purposes separated in our heads.