I already explained that the radio has no influence on the mutants inside. The only exception is if you make them panic and raise the base-wide alert.OK, this time I've chosen the same radio chatter lines as author of this video. The three mutants at the entrance were present so I was disappointed at first BUT three mutants guarding lockers with weapons and ammo at P2 (in the room where you can pick up riot shotgun) were gone. So maybe it's random.