I'm sure it was a flub on the website. There's no way the Sapphire could produce the necessary current without the max battery pack. I did have a passing moment of hope that Lucid had figured out some place else to put those four battery modules, but then I remembered that Erich Bach said the Sapphire preserved all the cargo space of the lesser Airs. Also, I later noticed that the thumbnail photos at the bottom of the Sapphire home page showed rear seats with the higher floorboard. So my hope was snuffed out.
I'm still on the fence about trading up to a Sapphire, as there as some things I like less about it than the Dream Edition . . . but getting that rear footwell space would have cinched it for me. (I would willingly trade away some cargo space to get those deeper footwells, but I'm reconciled to the fact that that's not going to happen.)