Since everyone has given you the breakdown on alcohol on this diet - I'll give you some experience with it ...
During my first Phase 1 (I'm on round 2 now to lose an extra few) - I did great for 4 weeks straight with no alcohol at all. I am an avid believer in red wine health benefits and usually enjoy a glass in the evening.
During my 5th week I was hosting a party at my house that I had been planning for 6 months (way before I started the protocol) and I did have 2 glasses of wine. I knew full well that I would and I stopped at 2 - as a side note, it didn't taste the same. That week I only went down .6 lbs and I was 100% besides the wine.
Obviously the recommendation is to NOT drink at all. If you do, that week of being 100% won't count for much at weigh in. As far as getting kicked off the program - well, I think that's a bit silly and if a coach threatened me with that - I'd find another coach. UNLESS, of course, you are constantly doing it and it becomes a major health issue.
Also - after 2 wines, I was basically drunk. Before the protocol I could drink a whole bottle by myself and still be good. So at least I've become a cheaper date
Good luck!