I think they land, they just don't do much. I had a friend who spawned into an iron banner match as the zombie undead. Literally the server decided he was dead on first spawn, nothing. Enemy players would just run around him as he dumped ammo on them barely taking damage, he'd throw a grenade or a venom smoke bomb and it would barely touch them, it wasn't until he shot a few people with his super and got multiple postmortem kills that we realized the server had him registered as dead, lord knows what the other players thought they were seeing. So I think what it is, is any damage you do as you're dying is significantly reduced as soon as you go down to make it much less likely that you will "Trade kill" each other. They want one person to always win a one on one fire fight. There's just nothing else to explain what I was watching happen in that match other than they actively try to obstruct postmortem kills.