This actually makes sense. They're using marketing terminology to be say "walnuts will do this, prevent this, and help you out with this".

If you want to market your product like a drug, you should go through the regular inspection to make sure all your claims are satisfied, just like any other drug.

No, it doesn't make sense. The consequence is that no food marketing can make (even truthful and not-misleading) claims about the healthiness of the product. Carrots are healthier than Twinkies? Not unless they're a medicine.

The problem is in the claim that they can be used to treat disease.

Anyone can make false statements and there should be safeguards to protect consumers, especially the sick and vulnerable.

Saying carrots are healthy is one thing, but that doesn't mean I should be allowed to market them as a cure for some illness because "vitamins".

IMO that statement is actually misleading and the FDA made the right call.