It definitely does not do this. Umineko states many times that Knox is not an absolute rule, merely a tool to use as a starting point for deduction. SSVD’s rules were straight up criticized for being too rigid and limiting. Taking their own interpretation and keeping it at heart was exactly what Umineko encouraged it’s readers to do.
This is simply not true. Everything in the metaworld was made out of human wishes, desires, pains, and and emotions. Every fantasy character represents something very core and human to the story. Zepar and Furfur are an obvious example. They are demons of love, the main driving motivation behind the entire incident. They constantly remind the reader to look for the motivation, the heart of the story. They are two people, but they are almost one character, they have different genders. They are a representation of Yasu herself (himself), identifying as both a male and female, having more than one persona.
I won’t say the way you viewed Chiru is wrong, because Umineko is all about finding your own truths and interpretations. It just saddens me to hear that Chiru lacked the humanity you desired when to me it had much more of that humanity than 1-4 did.
Episode 7 was entirely focused on that, on the emotions of the characters, on the tragic trail that led to the horrible Rokkenjima incident. Episode 8 was also focused on the characters and their humanity. It focused on reminding the reader that humans are multifaceted. That just because someone might be scary, scheming, or perhaps even murderous in one situation that they could still be a loving family in another. That the speculations of the news and strangers based on facts of financial troubles or past scandals would always be missing the positive, light side of the humans they were discussing.
Episodes 5 and 6 were also focused on the heart and humanity. The entire story with Natsuhi was showing how using a few “facts” one could make assumptions about the character of someone and force a truth about how horrible a person they were upon them. It was about how you cannot prove love, you cannot prove your thoughts and feelings, and that those who find the clues, the few written thoughts and feelings, will interpret those without knowing the full picture. Episode 6 focused on love, on the struggle between Shannon and Kanon and Beatrice, on the impossible situation they were in, on the true heart of the tale.
So when you claim Chiru was all about meta-mystery elements fighting against each other I disagree. Chiru was a tale of love and tragedy. Of accusation and forgiveness. Of trust and distrust. Hell thanks to the additional meta framing of Chiru you can view the entire story as Ange’s path to coming to terms with the tragedy as she reads the tales written by Hachijou Tohya. You can view the entire story as Tohya writing to come to terms with his memories of Battler put him to a final rest.
The meta elements about the nature of mystery are only a single facet of Chiru. Even a character like Erika, who’s main role was to represent readers without heart, who merely search for the answer, was provided very human motivations. A single scene which clearly conveyed how she had her heart broken by her own doubts. How she couldn’t trust in love over evidence, how she suffered from the inability of humans to prove an absolute truth, especially when it comes to their feelings. This is a very human thing, as many relationships fall apart due to trust issues.
1-4 may have had humanity within it’s mystery, but Chiru turned the mystery itself into humanity. It reminded readers that the characters were people, that the crimes have motives, and that the truth is clouded by the thoughts and feelings of those who interpret it.