Yes, that's the idea. I hope we'll never have to use them, but... just in case. Before, the ROMs were saved silently under ML/LOGS (and it's still done whenever the ROMs are not found there, for example, after you format the card).
So far I've reflashed my 550D and 60D with ROMs from other users, and then back with my original ROM, so there are some chances for this to work, if anything goes wrong.