The summary summarized away the clarifications. Here's the gist:

While it won't be implemented right away, we're working on the FC crafting for the expansion at the moment, and within that, we are developing things for the mid-level players. And then in addition, in the next raid content (the one after the Final Coils), we're planning to have two difficulties "Hard" and "Normal" go online at the same time. If we look at the currently available content, it would be like taking the current Coils raid, make it easier, and call it the Normal mode. It will be something easier than the Final Coils people are doing right now. But Hard mode would also be harder than the current Final Coils as well. So start from the current difficulty, then replace it with one that is slightly easier, and another one that is slightly harder. So by providing contents of differing difficulty at the same time, players can find the content that matches their play skill.

That's roughly what I get from the actual video.