Yeeeah, no. I would not like it at all if my team still moves to the losers bracket, especially since I just won a match that I would not even have bothered with if I knew my team was going down with 1-2 anyway.
Since this is messed up to the point of no repair, I propose a solution:
After round 1 is done, hold a special round where post editors and their opponents can redo their match if both sides agree to it. After that, people should know better than to edit their posts, so make everything auto-loss, without exceptions.