“It is a sign that people aren’t happy within the U.S. government, clearly. The shooting [of Good] was the last straw for many people," Dominick Skinner, ICE list founder, told The Beast.
Information included in the new leak includes around “1,800 on-the-ground agents and 150 supervisors. Early analysis by the organization suggests that around 80 per cent of the staff identified remain employed by DHS,” according to The Beast.
Possibly it’s an incomplete archive? I have no idea what the original site looked like, so I can’t confirm if the archive is complete or even if it’s legit.