Dude a dvd is such old tech. I mean we're at 4k now, even Blue Rays are kinda the poor cousin now, although they look and sound great. But there's really no excuse to not have it.
If I was Anthrax I'd take it as a bit of a slap in the face. Like "you guys aren't worth blue ray"
Hopefully, they just haven't advertised it..for whatever reason.