Yes, it can be confusing. My understanding is that you can vacate 20C via E7 because taxiway E7 isn't closed, only the junction is. There is an acute right turn you take onto EP which is not closed. If you happen to roll past E7 then you will have to backtrack the runway. In saying that, usually they have segregated parallel ops so all landings will be on 20R and take-offs on 20C so it doesn't become an issue unless you are taking off and reject on 20C.