IIRC, didn't the NX-01 Refit concept/design first appear in the "Ships of the Line" calander, another licensed product?
At any rate, I look at this as a licensed kitbash. From Round 2's prospective, this makes sense - minimal new tooling and they get a whole new kit to sell (and re-release for years to come) at a minimal up front investment. Paramount get's their cut, so too would Drexler (I suppose).
As to canon or not, I leave that to others. I'll probably pick up a kit or two on clearance just to toss into the collection..