I wouldn't call these guys Deathcore, but the vocalist does sort of have a style similar to that genre. When I first heard the vocalist on The Sentinel's Order I thought I was in for a breakdown fest, but I was pleasantly surprised. This is some solid Modern Death Metal.
I'm afraid that TRH are probably nothing but hipsters now, soon to disband and form solo acoustic indie progressive folk rock albums and/or braindance/idm, whatever hipster pseudo-intellectual snobs listen too these days.
I don't understand how you couldn't call this deathcore...this is straight up deathcore. Nothing brutal about it. I still like it regardless I just don't understand why everybody makes such a big deal about genre. Just listen and enjoy the fucking music