That doesn't make any sense because TBDM isn't a deathcore band. They used to be metalcore/deathcore with their first album, but they're straight up melodic death right now. Their song structures don't resemble -core in the least bit (neither does trivium's last labum, thankfully). For example:
http://www.youtube.com/watch?v=RS4o37I5dMk
Is a
very European sounding song, which is the direction they're heading. It's still got some American flair to it though, which is why I think it's such a unique sound. Now, how they're
percieved is probably completely different than how they actually are. Just have to keep in mind though, a -core band won't be touring with one of the biggest names in death metal(or viking metal, but it's pretty much death metal with viking themes). Speaking from a musican's standpoint, TBDM are great and what's even better is the fact that their more complex style is getting popular amindst the droves of untalented popular bands(seriously, the fact that Emmure is popular just makes me cry).
Naturally, I still can't stand Amon Amarth for more than one or two songs, but the same goes for Turisas(although Rasputin was AMAZING) and most other viking metal/battle metal bands. I wouldn't call them a plague like a lot of the -core bands(hilarious that great bands like Unearth who created the genre are unknown to fans), but I'm afraid I'll never get into their music.