I did decompile the map in question - not beacuase I wanted to steal something from valve, I only do it when I want to learn something that isn't doceumented elseweher - and a lot of other maps, and it seems like every map, starting from d1_trainstation_06 have an equip system based on a point_template, an env_entity_maker, a logic_auto firing it's OnNewGame output, and the corepiece of it all: A lot of items given the same name, player_spawn_items.
So far, I haven't found a single instance of a game_player_equip entity in any of Valve's singleplayer maps. As far as I know, the entity is used exclusively for multiplayer maps to give the default weapons, but I may be wrong.
Anyway, the map also have a weapon_rpg entity named player_spawn_items to be spawned from template.