The contentious issue isn't that they made the call in spite of this. It's whether this is actually true, and I'm not sure why people are pretending it's clearcut.
For one, no, he did not have time to reset. People keep saying this, but resetting means the goalie is fully in control of where he is standing, and time isn't a factor in his positioning. If Rittich reset on this play, Strome would not have had a whole open side to shoot at. He had time to get to his feet, yes, but that isn't the same as recovering; that's just his best attempt to give himself a chance to save it.
Now, it's probably not a situation where he had time to reset anyway because of the time between shots. But I would also not say that it's a situation where saving Strome's shot was impossible. The question the refs had to think about was this: was there contact made by McDavid that reduced the goalie's chance to make the save. They saw his arm being dragged to the right when he needed to move to the left, and concluded that it was enough. That's all there is to it.