CiG
Approximately Infinite Universe
Why? What is so important about vocals in death metal that means the music becomes pointless without them? There's so many generic growlers these days that add absolutely nothing to the music and seem to be only there because they feel they need to have vocals.
Corchado's vocals have been on the decline, with Farseeing featuring his worst performance yet so it makes sense to make an instrumental album rather than putting in a mediocre vocal performance just for the sake of it.
They also could have hired a new vocalist.