[Spktyr]

There still isn’t a semi-auto ‘real’ AK-47. The Russians assigned them all different AK numbers. They themselves stopped making the original AK-47 with the AKM of 1959. Most “AKs” are actually AKMs or derivatives.

[Charles Martel]

Right, which is why is mentioned "separately designated". The "AK-47S", "AK-S" and the subsequent designations used were mostly done to make BATF happy.

I'd say that the milled-receiver Chinese rifles like the Polytech Legend come pretty close to being semi-auto versions of the "original AK-47", but it's certainly true that most semi-auto AKs are based on the stamped-receiver AKM.