Goaltending wasn't the difference for the Islanders in this series
Patrick Roy decided to go with Semyon Varlamov for this series. Despite having Ilya Sorokin, who is widely considered one of the best goaltenders in the world having a down year, they went with Varlamov.
Varlamov was good. Roy had him when he was the coach of the Avalanche so it wasn't very surprising to see him go with his guy when Sorokin was struggling.
The veteran goaltender had a 2.70 goals against and a .914 save percentage. This clearly shows that he made a lot of saves but the Islanders didn't play very well in front of him.
Because the team in front didn't play better, Varlamov wasn't able to be the difference in the series. Frederik Anderson had a .912 save percentage and a 2.25 save percentage which are great numbers as well.
Because they were about even in terms of their performance, the goaltending wasn't the difference. The Hurricanes were simply the better team and are moving on as a result.