There is nothing in the man's post to indicate she was traveling as a UM.
This is yet another reason why the procedures at the checkpoint have got to be given the light of day. Many parents whose children are traveling by air the first time may not be aware that their children are subject to having their private areas groped...and their children arrive vulnerable and unprepared. Some of this travel may not be optional -- court-ordered visitation, for instance. This is a problem whether parents are traveling with them or not, but it's absolutely insane to grope a child's privates outside at the very least making a parent aware.