The closest there is to that would most likely be a d1 and d2 lore discord, and not much else.
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There's a few of the older lore communities, but sadly they all seem to hate Destiny and don't really want to talk about or play it.
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You could make one of your own. I’m sure there are some theorists out there who will join.
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I'm getting too old and tired to spearhead projects like that these days. I've founded enough clans and communities in other games for nearly 2 decades and been a community manager in another game. I just don't have it in me to manage one right now.