Don't get caught up in that opera style, there were around 5 styles of singing in that song.
Here one with pop and rock stylings and an insane scream near the end.
Call it what you want, it still sounds like an opera singer to me. I get the old viking battle cry in metal music, well, at least that is sorta the vibe I'm getting from it. I don't have any Viking heritage, so maybe that's part of it.
Enjoy the music you like, but I think Despised Icons have a few dynamite songs. Even with their growling tendencies.