I am not convinced. If the original collected melody line is kept then the person adding the harmony is not man-in-the-middle between the source and the listener. The listener is getting something 'based on' what was collected.
And maybe even if the melody line is worked on. Is Vaughan Williams' English Folk Song Suite mediation?
But I did say earlier that I think regarding performer -> audience (in the widest sense) as mediation makes the term less useful. Something like 'interpretation' may be better for that.
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sj