The response on FB from P&O was
As is normal with this type of comment on FB there is total outrage and if what has been posted is true then it would appear to be wrong.Having done a full safety assessment with the guests our medical team felt it would be unsafe for them to travel on the ship unaccompanied. We have offered the guests a full refund and will be discussing this further with them.
My gut feeling, though, is that there is a part of this story that has been omitted - otherwise known as "Why spoil a good story with the facts"