Simple really. He cares more about home performance whilst everything picked up on the road is a bonus.
46 games, 23 at home. 23*3=69.
If you pick up 10 points on the road then you are most likely up.
Obviously that is being a bit stupid, we won't win every home game so if we drop say 15 points worth, 5 games and we pick up 25 away then we will go up.
54 at home - so far 15/15
25 away - so far 7/18 after today
22/33 = 2/3rd's of points collected.
2/3rd's of the total points on offer will take us up. We are well on form.
79 points will see us promoted.