>>12011253It's an illusion in the same sense as if it would be an illusion if you programmed a computer program to print out "I am conscious, don't turn me off". You wouldn't use the same counter argument there of "but to have any thoughts it requires consciousness in the first place so it must be conscious", because we can clearly see that there was never any thoughts to begin with behind the program printing out the statement. The same thing is fundamentally true about our belief about consciousness, except that its creation is much more complicated.
The biggest pill to swallow here is probably that to be deceived about something, it doesn't require consciousness or some mystical direct awareness of that deception, it just requires an expression of something that more or less corresponds to a false belief, which would be our intuitions about consciousness.