100% off is free, no matter what the base price is, so that's clearly not true. (Though, oddly, it's not uncommon online, with a “just pay (inflated) shipping and handling charge” proviso.)
The guy meant 100% of the new price off from the old price. It's a bit of a reverse temporal brain fart, but it is a valid statement. For some reason I just instinctively knew that this is what he meant.
I mean, if you go into a jewelry store with a gun and declare that everything is free you can get everything for 100% off (probably just the one time, though).
> I mean, if you go into a jewelry store with a gun and declare that everything is free you can get everything for 100% off (probably just the one time, though).
Maybe not even that; they are obvious targets, and as such precautions are common.