I'm not getting involved with the everlasting metalcore troll-war that ravaged the kingdoms way up above me, but deathcore is something far too new for TBDM. If you manage to wake up and smell the asphault, you may realize a lot of these alleged metalcore bands  
 are really just melo-death/thrash, but with a different fan base and aesthetic. Proof? Fear My Thoughts, Neaera, Hatesphere. The difference between TBDM and aforementioned bands is that their sound was completely overhauled from Unhallowed to Miasma. Listen to Closed Casket Requiem on Unhallowed, then skip over to Miscarriage on Miasma. That's quite a trip on the genre map. I bet if Trevor stopped his incessant bitch screams and focused his throat on the grunts, and then grew out his hair and toured with Arsis, they'd be receiving kudos from all the self-proclaimed metalheads of the world. But back to deathcore, no. Deathcore molests Grind and Brutal Death Metal the same way Metalcore did Melo-Death. That might turn into its own can of ass in a few months...