Ralph literally cannot die from normal means.
He caught the eye of the Dark Gods from a young age because the Big-E marked him at birth as a wrong-un.
Tzeentch looked upon his retardation when he was a child, knew what category to put him in, and twisted his mind towards vices and trickery before handing him off.
Next, Slaanesh looked upon his excesses as a teenager, started to grow interested and began twisting further, and then dropped him when violence moved beyond pleasure.
Khorne took him up as his brutality grew into adulthood and fully harnessed it, spurring on his violent tendencies, and passed him off when he proved he couldn't even beat and finish off a workout, let alone a woman or a wank.
And finally, Nurgle then embraced him as an incomplete project and has ever since been working on him ever since to twist him into something else as he happily drinks piss and eats shit from whores.
He might not die of regular means as that is the Unclean One's blessing. That you who so fears death shall never die, but your body will become a temple to disease to make it happen.
That's what we're seeing here. We do not see a man, but a coming avatar and champion of Grandfather Nurgle the Lord of Plague himself.