From what I can find out you cannot say that with any certainty- there isn’t the evidence.
Saying that since the TTS has it so will the rs3 isn’t strong enough grounds imho. It’s a different engine for which it is common practice to pump fake noise in (s3 golf R etc all had it) whereas the 5 pot hasn’t and hopefully won’t either.
That all being said I still wouldn’t be surprised if there was some sound piped in via the speakers, but so far I haven’t found any evidence that it is the case…
Audi has said no but they never get things wrong
The actual info available on the Audi website is terrible - just pushes you towards configuration mode but doesn’t give any details, not even a proper spec list or brochure that I can find? Normally that sorted thing would be confirmed in their literature but I can’t find anything with any details.