I wonder if Terence agreed to have this published. This is an intimate look into the private life of an eight year old, written up as something like a lab report; it's not research on bacteria or monkeys or anonymous study subjects. It's possible that he did give permission, of course.
I didn't realize this was published at the time. Still, I wonder what the current, adult Terence thinks. Whether or not legal recourse is available doesn't change Tao's feelings about it and isn't determinative regarding republishing it now is a good idea.