Elephant garlic is not a true garlic, though culture, harvest, storing, and use are all similar. Here is what thegarlicstore.com says about cutting the scapes.
"Incidentally, many people wonder if the scapes should be cut in order to increase bulb size? For elephants the answer is definitely yes. For hardnecks, yes appears to be the correct answer also, although some varieties seem less affected by leaving the scape attached. Cut them generally just before the scape has fully extended (or the coils in the Rocamboles have started uncurling). When still young, the scapes are considered good eating by some."
Here is what wikipedia says about the very mild flavored elephant 'garlic'.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.