> Did it though? Most people young today probably never pressed a physical play/pause/stop button in their lives.

It's hard to call this an example of "skeuomorphism". Those icons were introduced on physical buttons with a certain meaning that everybody had to learn. They have exactly the same meaning on software buttons; the interaction that people have with them now is the same interaction that everybody has always had with them.

This isn't a case of the software appealing to a visual metaphor that made non-metaphorical sense before the software. It was just as much of a metaphor originally as it is now. You might as well call the word "edit" a skeuomorphism in modern software because past software also had "edit" menus.