You don't have to access MGSV's online/FBO play or Metal Gear Online to get your GZs bonus stuff, no. If the saved game is already there then it will access it automatically; otherwise you have to back out to the menu and download the GZs data, but that doesn't connect you to the online play server. It does take a few seconds, but it's probably cheaper than buying Ground Zeroes on PS4 and 100%ing it again.

Cool, okay. Thanks.

Since it requires you have a GZs save to access, is it banned in any% first ending?