PS3 Update Folders

I downloaded Persona 4 Arena Ultimax, and after unzipping it tells me that "the update folder has been removed to save space and bandwith." Is this really necessary? This website is usually very reliable, and DLC/updates are part of game preservation. Also, personally, this is very annoying, as I am trying to get the 3 DLC characters and cannot find out how to anywhere. Does DLC really take up that much space compared to the games themselves?