I think a D3 "likely letter" can be whatever the school wants it to be. My son received one, they called it exactly that, but it was basically a confirmation of the pre-read, before he decided where to apply ED.
I'd note that anxiety is not confined to HA; we've known people who were stressed about getting their ACT scores up to 20, after NLI. The NLI does not mean you're in; it means that if you get in, here's the scholarship.
This is a very long two weeks; good luck to everyone.