clearly you aren't a fan of death metal because these guys definitely ARE NOT shitty deathcore
though I'm really not looking to start an outrageous debate about genres, this is death metal in its finest form. The music is extremely heavy and technical and the vox are brutal as fuck. Deathcore, at least from my understanding, uses more generic metalcore type riffs and attempts to become heavier by using mind numbing chug chugging (see bring me the horizon...), whereas here the musicians are actually talented and write extremely technical shit.
Actually no. Deathcore, in technical terms, is a combination of the breakdown-esque nature of hardcore and metalcore fused with the technicality of death metal -- which is exactly what this is; it has both extreme technicality borrowed from death metal and the numerous breakdowns of metalcore and hardcore.