The file says
weapons WP_MELEE|WP_BOWCASTER|WP_ROCKET_LAUNCHER|WP_CONCUSSION_RIFLE
But WP_CONCUSSION_RIFLE isn't the correct name of the weapon. It's supposed to be just WP_CONCUSSION. JA won't recognize the weapon name unless it's 100% correct. If there are any incorrect letters, you don't get the weapon.
The valid weapons for JA are:
WP_NONE, WP_STUN_BATON, WP_MELEE, WP_SABER, WP_BRYAR_PISTOL, WP_BLASTER, WP_DISRUPTOR, WP_BOWCASTER, WP_REPEATER, WP_DEMP2, WP_FLECHETTE, WP_ROCKET_LAUNCHER, WP_THERMAL, WP_TRIP_MINE, WP_DET_PACK, WP_CONCUSSION, WP_BRYAR_OLD, WP_EMPLACED_GUN, WP_TURRET
We could easily fix this by changing it to
weapons WP_MELEE|WP_BOWCASTER|WP_ROCKET_LAUNCHER|WP_CONCUSSION
Shows the extent to which he tested this damn map. Anyway, fixing this isn't really "changing" anything away from Oink's original intentions. It's like fixing Hoth bridge crusher lame, it's just fixing a shitty bug that the creator didn't realize existed.