I was surprised too that ISO value in the exifdata didn’t change denoise value’s in the tool it stayed 40 when magic want was active. Which would imply “automatic”
Too long ago to remember the details. I think the original thread was even older.
I need to go to work so can’t dig deeper at this time.
Something about they remove the noisyparts before demosiacing and therefore before lighting/brighting is applied which would also be applied on the noise particles.
That’s why ISO value isn’t effecting automated deniosestrenght…
I believe that was dxo’s explaination.
From that moment i just made partial presets in my camera’s iso sections.
So when i have a lot of high iso shots i just apply that.