It could even be that because of the existing unrelated backlinks, Google algorithms decided to wait for a real link to show up. Not saying this is the case, this is just speculation, but the initial link profile isn't good. Perhaps Google is just waiting for now.

My tiny simple website has no backlinks what so ever, so the link profile doesn't exist yet. No reason for Google to mistrust it.

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Otimização de Sites (SEO in Brazil)