Apparently this is all the rage for 2nd (and subsequent) marriages in the Episcopal Church here as well--or so said a friend who is a priest in that church. I suppose it beats the fiction in the American Catholic Church of pretending that previous marriages (some of them lasting 30 or 40 years) didn't really exist.
That's not what an annulment says or means. It's formation was flawed in some way, so the basis for it to continue to be recognized as a marriage would wrong.