OKAY, I think I figured it out (my concern from before about whether or not Tabata said they can or cannot complete the game with DLC):
1. I think what he's saying the Famitsu interview is that with the current episode format, it is impossible to complete the game essentially, meaning that if they did character episodes for the next 4 DLC, it wouldn't make everyone happy.
2. But then I think he talks about how they are doing a different/new way of doing DLC that they haven't talked about yet in order to accomplish that! Apparently Episode Ardyn will be the first sign of this new type (I guess it won't exactly be a separate character episode?)
3. Basically: They still have all intent of making the game as complete as possible, but need to look beyond character episodes in order to do that. And also they want to make it meaningful.