It is, and I assume that that' what they'll end up using.
So they might end up technically meeting their target of "unmodified current devices" being able to use this, given that Samsung announced they'll be integrating 5G NTN IoT into some of their devices – but I highly doubt it would work with regular old (broadband) LTE or 5G phones.
They do mention « eNodeB » on the page, so, that's LTE.