My guess is the tech may have called it a recall (because people know what that is) but that it was really a TSB (technical service bulletin).
TSBs are small fixes that a dealer is supposed to do to any car that hasn't received the remediation specified in the bulletin, even if the car isn't in for a problem related to it. However, TSBs are only REQUIRED to be performed on in warrenty cars and do not require Audi or the dealer to reach out proactivly. They tend to be smaller stuff like quattro16 mentioned, though some OEMs have been known to try to hide something that SHOULD be a recall in a TSB to avoid bad press (Subaru, for example).
A full recall would involve your dealer calling you to let you know to being the car in, and they tend to be larger safety or reliability issues.
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