It's awful that the punishment dished out is so meaningless and lenient. University students should be bound to a code of conduct. Would a lecturer keep their job if they were found to be saying or writing such things? If not then the students should not keep their place at the University or be allowed to return at any point in the future.
I have great sympathy for the young women who were named in the group chat. On top of that though, University's lenient decision to let the young men back in to study after one year damages all females. The message to us all is that men can write the most vile things and incite violence and hatred towards women but it's not that big a deal.