I wouldn’t say it does. Remember, he’s still in Elementary school. I would look into a million other potential causes first, if he doesn’t grow out of it.
I never had a problem creating thoughts, or articulating my thoughts into words until I started taking medication for my ADHD. I do not recommend any treatment at his age. Wait until high school.. Like I mentioned earlier, if there are no improvements by that time, and you have ruled out other stuff, then consider diagnosis/treatment.