I mean, I can't say for sure, but-- it's the only thing that makes sense.

[ Because they definitely don't have turtle-people like that in Remnant. (Blake has, in fact, met other Faunus like herself that had turtle aspects, but they weren't anything like this guy). ]

This garage is a little low tech, compared to my world. And in Remnant, our propulsion is made from an elemental component called Dust. There's canisters of liquid in the garage that I guess are meant to fuel the cars, but I'm not familiar with it.

[ She tucks her arms around her middle, a protective little gesture that she isn't wholly aware of doing. ]

So. Other worlds it is, even if it's a bizarre explanation. [ Blake's mouth twists in a wry expression. ] You really had a bet with your brother about whether other worlds exist? That's a pretty specific thing to bet about.