Oh boy @Coleen79 - what an absolute bummer! I've been there - I assumed all baba ganoush was made with just compliant ingredients and was on my 2nd tub of a particularly delicious brand ( ) when I discovered sour cream in the ingredients. GAAAAH!
I think you can find the official stance here: https://whole30.com/start-over/
For me, it comes down to what your goals for the program are. With the great cream incidence (day 9), my goal for the program was to be hyper-compliant and do a proper W30 reset so, it got turned into a W39 and I felt great.
Today, if I were to discover sulfites in my vinegar, I would ignore it and carry on because, after 4 W30s, I know sulfites aren't problematic for me and it's not as important that I do a strict W30. I'd be pissed off mind you, but I wouldn't start over.
Whtever you decide, I'm cheering you on!