Yes I did, and he is talking about the same thing I did. Divinity as a skill (what you've been babbling about the entire time) is different from Divinity as a trait, but they are grouped into the same thing in FGO gameplay because both indicate your Divine status.
Divinity as a skill indicates "how much of a divine spirit you are", and if you are a monster this might affect your rank as a Divine Spirit (but that did not happen to Tamamo, her Divinity is still A despite most of it already being sealed due to being a servant + self seal, her being considered an anti-hero Monster like Medusa didn't do shit to lower her rank). Divinity as a trait is "you are considered Divine". The chain of heaven works as long as you are considered "Divine", meaning it works on both types of Divinity.
Just look at that list, even Lahmu being born from Tiamat is considered divine, as it is considered part of her body - the body of a God, a divine as fuck being. Bull of heaven, sphinx are divine beasts, Ereshkigal is goddess who can turn huge ghost form, Greater Grail is ??? and Mitsuhide Mara despite taking the demon king of the 6th heaven role is also divine. As long as you are divine you are targets of anti-divine NPs, not that you must have a skill that give you a rating of how high you might be as a divine spirit.