I don't understand your point. They had 12.5% of the vote and got 3/49 seats. If we had proportional rep they'd still have gotten 12.5% of the vote but a lot more seats. Is that your preference? Anyway, it sounds like you don't like them. Why?
https://en.wikipedia.org/wiki/People%27s_Alliance_of_New_Brunswick
I don't like them because they are populist garbage.
Just because I don't like them, doesn't mean that I support an electoral system that is unrepresentative. If they had 6 seats in a proportional system, that's what they deserve based on the number of people who voted for their mouth-breathing idiocy.