We do not and cannot get into people's private message boxes.
I think that poster is just trying to put PH down. But we wouldn't know anything and wouldn't be able to see anything between two people if one of them didn't show us their conversations.
We respect people's privacy and integrity on here. So, let's not rush to blame Admins for problems between any two PHers. When you are at each other's throats, one will normally share your private messages. So, be careful about that. But Admins wouldn't be able to and wouldn't get into your message boxes. When we insist on respecting one another's privacy, we hold ourselves to that stand as well. We don't just get into anyone's box. Private verbal fights between two people aren't public and so we do not need to get involved.