Those single digit QLP victories were I presume against a more or less unified sovereigntist vote under PQ. If QS+PQ wind up getting >50% as they are currently are, or even if they manage to combine for more than QLP, it would be significant.
The ADQ and CAQ took from both sovereigntists and federalists, so it can be difficult to say. (Like elsewhere in Quebec, both the PQ and QLP have been trending downhill here since the end of the 2-party era in Quebec). PQ+QS>QLP was the case in 2012, though never before and not in 2014 (when QLP>50% on its own). SHSA was 53-47 "Non" in 1995, so it's certainly winnable for a sovereigntist party, even if that has not been done.