It strikes me as kind of unlikely, since it's the only Romulan ship we've seen with that kind of structure in 200 years of history. As well, the pods on the wing tips look pretty much identical to the pods on the Romulan science ship and scout ship from the same period... and those must be stand-alone warp nacelles, since neither of them have a ring.
But I guess anything's possible!
Maybe they decided to use a warp ring for nostalgia or something, and it didn't work out well, so they didn't design any more ships with them. Or perhaps since the D'deridex
is so incredibly large, a ring is the only way to generate a sufficiently large warp field, and the other ships don't have rings because they're smaller and don't need them?