Keyword contribution declined: "Does not meet contribution guidelines"

Hi, In #250409-204740-621000, I submitted "brother-sister-incest" on "Cassandre" (tt29580825), with an explanation: https://www.20minutes.fr/societe/4146703-20250405-cassandre-inceste-entre-frere-ur-plus-tabou-encore-inceste-pere But my contribution has been declined with "Does not meet contribution guidelines". Why?