This is related to this question.
The title of this new question"Does Sunlight Sensitivity impose disadvantage from Holy Nimbus" is definitely a different question from the older question "Does Holy Nimbus emanate Sunlight?". One is a question about how Holy Nimbus works while the other is about whether or not Holy Nimbus interacts with a specific racial trait.
The answer for the Racial Trait question does rely on the currently marked duplicate Holy Nimbus/Sunlight question and the last paragraph of the body of the Racial Trait question recognizes this - but I'm not sure that means it's a duplicate.
It's close enough that I could see it being a duplicate, but the question isn't "Does Holy Nimbus generate Sunlight", but "Does this racial disadvantage trigger from Holy Nimbus".
It's incredibly close, but I wasn't sure it was a duplicate - what is the correct call on this?