Horizon Mean Density Against the Aldred Limit: More Than Fifty Orders of Magnitude of Headroom

The mean density of a black hole, its mass divided by the volume inside its Schwarzschild radius, falls as the inverse square of the mass. For M87* it is 0.44 kilograms per cubic metre, comparable to a light gas; for Sagittarius A* it is 9.98e+05 kilograms per cubic metre, comparable to a dense liquid. Against the Aldred Limit density of 9.72e57 kilograms per cubic metre these are fractions of 4.49e-59 and 1.03e-52, headroom of 58.3 and 52.0 orders of magnitude. The mass at which a horizon's mean density would reach the Aldred density is 4.35e-20 solar masses, far below any astrophysical black hole. The spin-torsion bounce therefore has no bearing on the structure, formation, or imaging of astrophysical black holes, and any argument that imports bounce physics into horizon-scale phenomenology fails by these margins. That negative result is stated at full size because it closes a recurring line of speculation. Computed; not measured.