Just a variety of vocal scream techniques I can do that I've learned either from free sources online, and some trial and error on my part. At 4:17 , there is a pause before a snippet of a vocal cover I did while just sitting in a parking lot, has cleans and screams.
None of the vocals are edited at all, besides cut/copy/pasting things to reduce pauses when speaking, or to cut out a clip that I wanted. No compression or anything. All vocalists I know of edit vocals, whether pitch correction, or compressions and mixing things, even live. So if yours or my vocals don't sound like your favorite person's, that's why. Raw vocals don't always sound super great.