I'd agree to some extent, however there is a difference between scoring late and not deserving a result. I could just as easily claim that in a normal scenario we should have scored earlier in some of those games you mentioned. We can also mention offside goals other teams have gotten, as well as results other teams have gotten without playing particularly well. I'll agree that we have somehow managed to win a lot of games with fine margins, but I think this luck narrative is quite exaggerated. We have been unlucky as well this season with injuries, the winter schedule, and also a few games such as the Liverpool game where we should have had a penalty. And if you want to argue for how we were lucky to beat Leicester I could also argue that you were lucky to beat us.
From my point of view we've been the third best team in the league this year and currently sit third.