Do National Merit Scholars need to submit scholarship application?

I did not find this question addressed elsewhere. Does my National Merit semifinalist need to submit the scholarship application?

We learned in the online presentation that most (or all?) scholarships would not stack with the National Merit award, so I’d like to know if he needs to do this application. He is really burned out with all the applications he has done, so I am attempting to help him clean up any loose ends.