I’m not sure that’s true, it depends how you define an illusion.
One would be to say that Illusions are merely incorrect interpretations of sensory data. They can be experienced by beetles, and even amoeba.
A more sophisticated definition might say that an illusion is when a subject, which has a mental model of a situation, incorrectly interprets sensory data to create a major mismatch between their mental model of a situation and reality. If we take this definition, then since many mammals or even vertebrates construct mental models of situations, they can all experience illusions. For example an animal seeing a reflection of itself, or it’s prey.
The OP was trying to explain away consciousness as some illusion, while the person you responded to rightly pointed out "An illusion can only happen to conscious beings, so saying that it's an illusion doesn't add anything explanatory to the mystery of consciousness".
Your attempt to define/explain what 'illusion' might be is similarly unhelpful, because you are appealing to mental/consciousness related terms like 'interpretation', 'experience', and 'mental model'. It seems like you're depending on the very thing you're trying to explain away, just as the original 'illusion' claim did.
One would be to say that Illusions are merely incorrect interpretations of sensory data. They can be experienced by beetles, and even amoeba.
A more sophisticated definition might say that an illusion is when a subject, which has a mental model of a situation, incorrectly interprets sensory data to create a major mismatch between their mental model of a situation and reality. If we take this definition, then since many mammals or even vertebrates construct mental models of situations, they can all experience illusions. For example an animal seeing a reflection of itself, or it’s prey.