I don't want to put words in his mouth, but I'd imagine what he's trying to get across is that the difference between leaving a plot hole and leaving an unresolved story arc is the concept of catharsis. Plot holes are largely irrelevant in a good film because the story/character arcs are resolved and provide a satisfying emotional climax, a sense that you have finished a journey you started. If entire plot points are dropped, then there is an overall sense of emptiness because you don't feel that anything has been accomplished.
Essentially, the story or character arcs are the train tracks and the plot points and minutiae of events are the extent to which the tracks are maintained. A plot hole here and there can make a journey rocky, but you'll reach your destination anyway. If the tracks stop though, you're just stranded.
That's my take anyway, even if its not his.