Originally posted by kain IR channel removal only works on color films due to the different reflectivity of B&W film. Most B&W film has reflectivity in the IR channel, which color films do not. (Thus the usability of the IR trick.)
The reflectivity you state is the silver in
true b&w film and that is incompatible with IR based dust and scratch removal in scanners. However, the film the OP is referring to is a chromogenic b&w film - processed in C41 chemistry, and can be scanned using IR dust and scratch.