Update: Outside Lands has taken the site down and will be fixing the issues. Apparently the information was added to the public site unintentionally.
The information was added to site was no different than the information added to Coachella or EDC's lost and found site. It was in the spirit to help people reclaim their lost items. However, it appears one person's opinion is now forcing the volunteers who are managing the lost and found to add additional layers of security at the expense of time and effort.
My apologies if my bringing it to the attention of the festival organizers caused you any grief - this was certainly not my intention (I had not known this was even a hack!)