I think doctors can prescribe some of the meds "off label" for other, ADHD-adjacent symptoms, which makes it a lot easier to get you the meds since the way to get an actual "official" diagnosis is often onerous.
If they're being vague, it could just be because it's kind of a grey area and they're doing it for your benefit. It's probably better that you don't know.
I'm not an expert though, this is just what I've gathered from my experiences in the US.