Many survivors, when they enter the family court system, will receive advice from lawyers. They say that, if you don't mention the abuse, then you won't have the backlash of that parental alienation accusation, because parental alienation basically re-victimizes the domestic violence that the survivor has gone through by stating that they are unknowingly, not intentionally, sometimes without saying anything, transferring their fears onto the child. They don't understand that an abusive man who is an abuser to women is likely to also be abusive to a more vulnerable child.
This is a common recommendation. It really just speaks to, if you're a victim entering the family court system, a victim of family violence, the thin line that you walk on every day either trying to receive protection by saying, “Hey, there's abuse present for either myself or my child,” or trying to appease and not be seen as an alienator.