I agree with most of this, but I actually like that durge gets the baldurian tag. We know that their amnesia is inconsistent and incomplete--for example they still remember basic facts of life that any adult would be expected to know, they remember how to fight with weapons they're proficient with, and they even get occasional small flashes of memory about their murderous past actions. So I find it fitting and kind of charming that some of the things they remember, without knowing the context of why they remember, are also facts about life in baldur's gate. To me, it doesn't seem any more out of place than remembering other facts about religion, history, etc. like you can through various dialogue checks.
