Star earthing the ground plane

The ground plane has been hailed as the revelutionary breakthrough in all kinds of noise rejection. By providing one side of a circuit board with a solid copper foil which serves to connect all grounds together by one ultralow impedance connection, there can be no ground impedance to upset the signal at any point in the circuit.

Say anything different to this and you'll be shouted down one way or another by EMC professionals. One way is to criticise your circuit, after all, it must be your circuit because the ground plane is blameless.

After adding star earthing (the proper way) to a ground planed board I could hear an improvement. I could hear a more 'solid' representation of the music. This is obviously impossible so I must be making it up. Either that or I have introduced some variable which is 'doing wrong'. How can I be if the ground plane is blameless? It should simply 'ignore' the addition of wires routing grounds from one place to another on the same plane.

Kirchhoff however seems to have the answer and I could explain it but I found this article which does much better than I'm able:

https://www.scribd.com/document/53251315/Harmonic-Distortion-and-Board-Layout

(Kirchhoff explained that currents flow in circles - always back to from where they came)

Prof