Those 13 points are not final because Arsenal still have 1 game to play (28th match) if Arsenal win that match then they will be only 10 points behind, but yeah statistically Liverpool are hard to catch up they continue to consistently collect 1-3 points and from 28 matches Liverpool only lost one match while Arsenal as the closest competitor was defeated 3 times. According to the schedule Liverpool have 10 games remaining this means Liverpool only need 21 points or 7 wins to secure the title and I'm sure Liverpool will be celebrating before the season ends. As a gambler I wouldn't be surprised if Liverpool played badly in 3 games because it is still in the safe zone.
Apart from comparison of games lost, Liverpool has won 20 games while Arsenal has won 15 games. Arsenal was chasing Liverpool closely until they encountered a defeat against West Ham United that shattered there dreams of winning this season title. West Ham United win over Arsenal and Leicester City has given them 16 points clear of the bottom three and level with Tottenham Hotspur and Manchester United in terms of point but they have to stay at 15 because of goal difference.