Why aren't his statements on raping her admissible? Seems clear cut that he admitted to raping her. But then again I see people saying that those statements were faked?
Their veradicity has never been proven AFAIK. Der Spiegel obviously claim they're the real deal (and they unearthed plenty of other true things in the same leak, so chances are they're true), while on Ronaldo's side they pointed out that it's fake, and even if it wasn't it's inadmissible as it's a private document. Whatever the case, it was obvious long ago that statement alone (true or false it may be) is not gonna be enough for anything because it's not Ronaldo's official statement: the one they submitted back in the day was different, obviously without the incriminating part. Anyone's free to interpret it as they see fit but that was never gonna be enough to seal the deal, the only realistic option was if new evidence surfaced, which didn't happen.
This time it's not even really about the "rich guy gets away with rape" thing, in these circumstances I'd argue most people would have gotten away with it as the proof is inadmissible and questionable in its nature by default. The court won't rule it admissible or believeable based on the fact alone that a lot of other stuff Der Spiegel leaked was legit. The document's legitimacy was not proven and even if it were, it's likely inadmissible in court in that state. And even assuming it all did go to court with that statement being used as evidence, they could always claim he misspoke, he misremembered, he was drunk or whatever the fuck, as they published a "corrected" version which contained the "facts" shortly after. That statement was never gonna be enough as is, other evidence was needed which obviously becomes harder and harder to obtain.