Mr. Strassner, the manufacturer of HMS cables rejects all copper for his conductor material that contains more than 6ppm of so called ferro-magnetic particles, becuse more will dgerade the sound. So maybe it is not so far fetched that the aluminium alloy used for cds contain these particles also. Maybe all alloys contain it?
So if this was true, it would indeed make sense what Furotech writes.
I will ask Mr. Strassner about it and let you all know. He is scientist (physicist) enough to shed some light here.