yeah ok, but thats marketing talk.
the Game engine already simulates the DM by rolling the dice for you, having pre placed monsters and NPCs, that sort of stuff.
What you discribe would be something ackin to the defunct Everquest Next.

I can see larian attempting to do something like that, but i dont think theyll do it with BG3, from how i see it, BG3 will be very much a CRPG with fixed quests, enemies, potentially no respawning ones like the OS games and a set story.