File1326135553.jpg-(114 KB, 579x700, illithidhooker.jpg)
>Does this mean a Mind Flayer can be confused by a little kid's scribbles?
Quite the opposite, really. I'd think a mindflayer would understand them better than any human, save for the human child him or herself. Look at this bit from what you quoted:
>They project thoughts and feelings to each other in a way non-illithids can scarcely comprehend
Why do you figure that is? Why couldn't a psion grasp how Illithids communicate as easily as one of them? The answer is incredibly simple, really.
See, it should go without saying that Illithids don't think the way people do. They're about as alien as they come, hailing from another plane of existence and having senses humans couldn't even dream of. The way adult Illithids contextualize everything is entirely different from the way an adult human would.
Notice how I said "adult?" That's important.
See, by the time we reach adulthood, we've settled down into our perception of reality, grown accustomed to our senses and what they tell us. A child that grows up blind has a much easier time of it than a recently-blinded adult, and not just because he's had more time to deal with it. It's because, during his development, his ability to understand his world didn't hinge on being able to see, and as such the littler things like tying his shoes blinded are much easier to him.
If children of any race are a mostly-blank slate, it would make sense that human babies and recently-hatched Illithid larvae (assuming the latter is truly sentient) would have the closest mental states, that would only become increasingly more divergent as their lives progressed.
Because of this, the younger the child is, the easier it'd be for a mind flayer to understand. Just like for human adventurers, who can clearly and plainly understand the Illithid larvae's seemingly mindless drive to feed.