They're different technologies. Maybe there could be a "ammunition holding feature" superclass that both belongs. Clips don't have springs, and are used to tidy ammunition, and to aid loading magazines. Old rifles and some revolvers had clip compatibility to aid loading internal magazine. At some point the military stopped using old rifles and some revolvers, making removable magazines far more common.

But that is not even remotely relevant to the topic. The original article don't even use the word "silencer", nor "suppressor", let alone "clip".