Arctic Volcanoes

This article on volcanoes erupting under Arctic Ice warns that the heat from the volcanoes only warmed the water, and didn't have any effect on the ice. Yet, the volcanic eruptions coincided perfectly with the melting of the Arctic ice (Antarctic ice meanwhile has been accumulating). Why do I find it hard to believe that eruptions that warmed the water of the Arctic Ocean didn't affect the ice at all? Global warming really is a religion if scientists are making such an absurd claim to avoid any suggestion that other factors could have had a role in melting Arctic ice.