Not all messages are created equal. I’m not privy to the specific methods and techniques, but it seems pretty clear that where a lot of the effort goes in creating these subliminals is in putting them into a form that can be more effectively absorbed into our minds. The scripting is very important.
Because of whatever techniques of scripting Fire is using, the messages in your subliminal are far, far more likely than just randomly perceived messages and noise to be received.
Obviously the creators can speak best to this question, but this much I’ve picked up from the comments they’ve made over time.
Remember in the past, that @SaintSovereign actually recommended combining your subliminals with music that inspires you or stirs you because it puts you into a more receptive and transformative mental and emotional state.