It's strange, the Spirit has clearly been with Estrella long enough that she's survived infancy, and we can assume she was abandoned nearly after her birth (since her mother would've passed quickly after that). Does the spirit not know about her racial quirks? Is he unaware of their power to be forgotten?
Chances are he was the one keeping Estrella alive with his thoughts, so I can understand his restraint and callousness. However, if he already knew about what happens to people of their race, then it's weird how he talks as if they should know these things.
We can gather that the father had a child with the mother, the mother died and the child was forgotten and abandoned alongside that other building. When did the spirit come into play? Did the king know him and forget his existence alongside his lover and child? Did the spirit come upon Estrella by pure happenstance?
But that wouldn't make sense. It's clear the spirit is attatched to the old palace gardens, as if he's been there for a while, but they were abandoned likely around the same time Estrella was. That must mean he was there from the start and to some degree bypassed the amnestic ability whilst totally disregarding it's exisence.
My question is; was he always in the palace gardens? How did he get there? What was he doing there? Is his tirade about the father's failures one informed on Estrella's race or not? If so, why berate him in spite of the fact that he knows why Estrella was forgotten?
Welp, the only way to know for sure is to read on and hope the author doesn't leave plot holes. Frankly, I don't trust the spirit. Too many possible contrivances could exist, I think her eyes are directly linked to his motivations. I don't think it's explicitly evil or harmful, but I think the spirit has goals of his own and, while it's clear Estrella means something to him, he wants her in the palace gardens pretty desparately. He needs her.