That isn't right.
If we assume Ipswich win their next 2 games they will have 82 points and a goal difference advantage over Southampton of 5 plus what ever they win their next 2 by. Southampton's next game is against Ipswich and a good win against them would leave them on 79 points going into the final game, which Ipswich could lose. The goal difference is not significant enough if it's below 10 for Southampton to throw the towel in given there will be 3 matches to play.
Likewise Millwall would be on 82 going into their final game if they win on Saturday