Aura rules say "All models inside the Aura’s area, including what is generating the Aura, are affected by the Aura as long as they stay inside the area and remain in LoS of the generating object."
1. There's nothing about targeting a model, it just says "affects". So, "buried models cannot be the target" should not apply here.
2. LoS rules say that a model always has LoS to itself. Regarding range, there are no clear rules about it. It's just said that range is a distance from one object to another. So, I assume that a model is always in range of itself, just like with LoS.
If a model is on a table, there's no question whether it's affected by its own aura, but we never check for range.