You know I was going to comment that he looks too intact to be a Plague Marine, but imagining him saying your quote made me reconsider that he could be a different kind of Nurgle follower. Like someone who tears things down because he reasons destruction will outlast any possible construction. A thing could only work less over time, but a broken thing only gets more broken as time passes into forever. That's the kind of troll logic a Chaos Space Marine can get behind!