Well, all right, but your wording in context did not make that clear. You seemed to be comparing Tolkien in general with with Lewis in general, not Tolkien with just Narnia:
“Tolkien built a world, something Lewis never managed or perhaps wasn’t interested in.”
You say that Lewis “never managed” the creation of a world, implying that the failure extended beyond the Narnia series. So I took it that you were generalizing about the totality of Lewis’s imaginative writing. And I would say that he did create worlds (even in the Narnia series, but also elsewhere); hence my objection. Whether they were coherent or plausible worlds, or were as impressive as Tolkien’s world, is a different matter.