This is being spun in multiple ways, as a rebuff to the DUP, and half way to a united Ireland, or on the other hand, a necessary fudge to allow talks to proceed to stage 2. As Prof. D. just said, it seems to suggest a hard border between NI and the rest of UK, which seems well, interesting.
The reactions are going to be interesting, for example, Scottish govt may well ask, why can't we have the same? What will the Ultras say to this? Maybe there is some sop to them about to be revealed.