Very unclear on some of their territory pages, but they're saying both in some of their marketing for this model:
https://www.reddit.com/media?url=htt...74988482af9e07
Carta can use the Mobius substrate and both words have been used to describe the panel for some previous devices.
As it's not clear in all territories for this device maybe it's a mistake. I was surprised to see mobius for a small panel, but maybe it's a good choice for a pocket reader. I can't remember seeing a 1300 panel in an ereader this size so suspect it's new.