If the car you're looking at has full service history then you should find a certificate that shows the car has had the recall. I worked at Volkswagen abd whst would happen, a customer would be given a certificate, and a pen and keyring in a box. Most e189 recalls was a ECU update (remap).
So in theory a new remap could help reverse this.
However some Audi models had an additional comment added which restricted the turbo or air intake I can't remember which as it was a long while ago I worked there.