'Fluidi biologica' means biological fluid. It is chosen deliberately to be neutral so it does not make any implications about the origin of the material. You are completely reversing the intent of the phrase. Elsewhere the phrase 'materiale biologico' is used about the same sample (Chris they listened to you).
In this report there is care taken to report only what was found, not to exaggerate or over interpret. The exact opposite of what Stefanoni does.
Actually there is no interpretation at all in Stefanoni's report. However, Stefanoni at the preliminary hearing was testifying as a technical consultant for the prosecution.
The Berti-Barni perizia refers to "fluidi biologici" (p. 15) as those fluids from the human body that can be recognized specifically through testing their own specific monoclonal antibodies each of which recognizes its own epitope protein antigen.
At p. 82, the report says "Amanda Marie Knox contributed with
her own biological fluids to trace I".
It clearly say, not only "fluidi biologici", but "
propri fluidi biologici", where propri is an
aggettivo possessivo that puts in relation the fluids with Amanda Marie Knox, and means "her own".
So the biological fluids are liquids that come from the system of Amanda Marie Knox, certainly not from the testing tube.
However, this does not prove anything. It only shows what words Berti and Barni actually wrote.
All that can be said was that DNA of Knox was found on the knife blade. No conclusions were drawn or could be drawn about the tissue of origin. It might be tears if Knox used the knife to cut onions, it might be epithelial if she held the knife in what we are told is the proper American way to use a kitchen knife, we just do not know. The least likely explanation is blood since no chemical or microscopic evidence of blood was found.
Now, if you want to apply a principle of Cartesian doubt, this is correct. But your argument was that trace I should be considered "unlikely" to be Knox's blood and unlkely to be related to the murder. I explained that this is not founded on the evidence set, because Knox's blood was certainly found on the murder scene and was linked to the murder by independent evidence. So there is independent reasons to believe there was Knox's blood on the murder scene.
Yet your main criticism seems to be still against Stefanoni, against which you seem willing to build an attack in an indirect fashion. I don't understand exactly which Stefanoni words you view as highly unethical or false. But anyway I can tell you that your "DNA ratio argument" by which you try to use features of a secondary and less significant element, as arguments in order to debunk a more significant finding, is legally unacceptable, and it is illogical. Moreover, the finding of MK's DNA on the blade is itself direct evidence against Amanda Knox, not just against Raffaele Sollecito.