I was getting exactly the same noise, took my cupra for its 30K service and it came back minus the noise but also the remap.
The noise also started after the remap but I guess my info is no use as you dont have a remap
Could then be the increased load put on the turbocharger by the remapping? As I wrote just above, I used to hear a similar noise (although very discreet) under similar circumstances...
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