That's pretty much it.
If he thinks the tests are "fun," that's good news for him, and you, and the evaluator.
It's waaaay better if it's "playing with these guys" than "looking for problems." One of them is chill. The other is going to put even a six-year-old's back hair up, and that's NOT what you want.
I told my son, at 6, something a little bit different: "I'm already pretty sure you've got a special kind of brain. I'm just not sure what KIND of special. I don't know if it's more like a tree or more like a rocket ship, but we need to figure it out so we can help you learn to use it properly. These guys helped me figure out how to use my brain, and I think they can help us figure out how to use yours too. So we're going to go play with them. Just hang out, and be you, but please try your very best to do everything they ask you to do, because that will help them figure it out faster." Something to that effect (though I HOPE it was shorter!!).
Eh, it worked. YMMV.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"