Yeah, I dunno what people have a problem with; this remains entirely consistent with the themes and ideas this manga has had from the beginning. Feels like a continuation of those who had issues with the switch to Farmland Saga and want their violence free of a point or message. Which is fine, I read that shit all the time, but for this manga that has never really been the point.
This isn't proof that there isn't an afterlife, which wouldn't be an issue anyways because that as I said is thematically in line with literally everything the manga has done, just that this dude dying (note it is DYING and not actually dead yet) isn't seeing all the shit he expected to which shows how fucking stupid their point of view was regarding what constitutes honor and bravery and what's important in life. This is literally an experience thousands upon thousands have when they die in real life where they expect flights of angels to sing them to their rest and then right before they die they feel and see nothing.