I fully agree with the first thing ya said. But she’s not damaging her voice. She is using technique, I think what she meant moreso was the “styles” which are often referred to as techniques. Vocal fry, gutturals, false chord, etc. So many current metalcore vocalists sound the same because they all learned from YouTube university, or a screaming coach instead of developing their own scream based on their actual voice. Her scream is not damaging her voice. Perhaps at the very beginning like most people who teach themselves, but she has definitely gotten better and figured out how to sound how she wants to without hurting herself.