Some spots are fine, others have seams. There are marked seams on the mesh, but the UV map is seamless, and removing the marked seams seems to have no impact.
Edit: No seam visible when looking at normals or tangent via a geometry node, nor when looking at the UV map applied to the model as color. I'm pretty sure it has to be something to do with the UV mapping node.
Edit 2: I've uploaded the file here.
Already enabled, and while there are some sharp edges, this one is left round. Even clearing all sharp edges makes no difference.