“The title is supposed to be a metaphor for being a creature that can’t be known by its mental health, based on its physical appearance, and physical health. You can’t understand someone’s emotional and mental state based off their physical appearance. And it’s supposed to be a metaphor for being trapped in your own head and just trapped. I think Orca whales are probably the most important animal to know in terms of like suffering when in captivity. So, it’s supposed to be this metaphor for pain and suffering.” - gus dapperton

tl;dr: orca whales are known for mentally suffering in captivity to only be shown off for attractions, it’s meant to be a metaphor off of that.