That's weird. Only place I've seen a rapid degradation of cables were those getting direct sunlight.
The conclusion paragraph seems doubtful to me though - unlikely that speeds will slow down from a cables external plastic flaking
I imagine there could be some slowdown if the exact wavelength of the transmission also happens to come in from outside where the jacket is missing.
I imagine there could be some slowdown if the exact wavelength of the transmission also happens to come in from outside where the jacket is missing.