They're not talking about just getting MemoryMaker and scanning the card, they're talking about the on-ride videos associated with them. I may have been incorrect in the other thread talking about Tower of Terror, and by scanning the reader by the monitor at the exit you may get the video too, but with Seven Dwarfs Mine Train there are no preview screens, no targets to scan and no CM's to talk to about the photos. They only link via the Band.
From here on WDWMagic back in October:
http://www.wdwmagic.com/other/mymag...ss-photos-from-today-at-walt-disney-world.htm
"Expect to see the MagicBand automated linking to become the default method in future attractions for on-ride PhotoPass, with video walls no longer to be added to new attractions. The latest Walt Disney World attraction - the Seven Dwarfs Mine Train will not be offering video wall previews, and will only offer MagicBand association of on-ride photos."
-Rob