Playing poorly yes but he is still doing what needs to be done to win games. As an example against Burnley he stated the team trained on set plays and in the match it worked, we scored twice from corners, Burnley were weak in this area and had conceded more goals from corners than any other team therefore he ensured his players were well prepared going into this game.
It is not due to luck that we scored two goals from corners for this reason.
The manager has more points than any other team in the last 15 games, these stats are misleading, our tough games are still to come but the point i'm making is that despite poor performances for quite a while now we have taken a lot of points, it is possible to still outscore the opposition if you take the few chances you get and you can increase the likelihood of this occurring by planning prior to the game to exploit opposition weaknesses.
You are right though, it could be luck, if he gets top four though after 38 games then it's not fair to say he is lucky. As of now who knows whether he is getting by on his planning and attention to detail or luck.
You do not need good performances to win games but they do help with that hence why he is rightly concerned about it. Also we will draw and even lose games between now and the end but so will our rivals, we just have to drop fewer points.
Anything is possible but all we can do is wait and see what happens.