You are probably not going to like this question, but doesn't Odouls have alcohol in it? I have never heard of anyone I am in AA with or treatment ever drinking n/a beer. Hmmmm.
Well- If you truly had no idea it was a real beer, then why would you change your sobriety date?
My sponsor was at a wedding after 10 years of sobriety and someone thought it would be funny to order her a drink with alcohol in it and she drank it thinking it was non-alcoholic. She DID NOT change her sobriety date because she didn't know. It was a mistake, not a relapse.
Just my oppinion. I would not throw away 4 years, unless you knew it was a REAL beer.