The Nazis knew a month ahead that they had lost the war. If it were their intent to kill the 'Jews' they had the mass murder weapons and the opportunity.
The Nazis could have killed every prisoner in those camps. It would have been like shooting fish in a barrel... BUT the Nazis received no orders to kill the prisoners. They were still alive when the allies got to the camps.
I might also note, there appears to be a WHOLE BUNCH OF PRISONERS WHICH DID NOT HAVE TATTOOS.
The Nazis had no intent to kill prisoners when they arrived or they would have all been dead before the allies got with in a hundred miles of the camps.