Scalar curvature deformation of isoparametric tubes

We resolve Ge's local scalar curvature rigidity conjecture for spherical isoparametric tubes. The conjecture fails throughout its stated radius range for families with at least two distinct principal curvatures, via arbitrarily small smooth deformations supported in any regular annulus. Geodesic balls of radius less than π2 are locally rigid under C² smallness. We also prescribe sufficiently small smooth nonradial scalar-curvature increments with fixed compact interior support, under antipodal symmetry for families with 2, 4, or 6 distinct principal curvatures and without symmetry for families with 3 distinct principal curvatures.