From the code:
"id" : "mon_zombie_survivor",
"name": "survivor zombie",
"death_drops": "mon_zombie_survivor_death_drops",
And:
{
"type" : "item_group",
"subtype": "collection",
"id": "mon_zombie_survivor_death_drops",
"entries": [
{ "group": "clothing_outdoor_set", "damage": [1,4] },
{ "group": "bags", "damage": [1,4], "prob": 10 },
{ "distribution": [
{ "group": "book_survival", "prob": 15 },
{ "group": "gear_survival", "prob": 25, "damage": [ 1, 4 ] },
{ "group": "survivor_knife", "damage": [ 1, 4 ] },
{ "distribution": [
{ "group": "survivor_melee", "prob": 40, "damage": [ 1, 4 ] },
{ "group": "guns_survival", "prob": 60, "damage": [ 1, 4 ] }
], "prob": 50 },
{ "group": "survivor_grenades", "prob": 15, "damage": [ 1, 4 ] },
{ "group": "stash_food", "prob": 40 }
] },
{ "item": "cash_card" }
]
},
I think you are having the wrong idea behind survivor gear, in this case. It is just the makeshift weapons, not the higher end craftable survivor stuff. more stuff like tools, weapons, etc. Aka, like survivornaginata said. Starting players who died.