Thanks to Sheffinder and john.phil for locating and translating the report in posts #10–12. In the report PDF, page 3 describes a "documento manoscritto"; page 9 limits its conclusion to "il solo campione esaminato" and identifies "22 agosto...
Welcome!
Regarding metereology: before Metabunk, Mick West created https://contrailscience.com/ , in case you weren't aware. (Metabunk is the right place to discuss anything that's there, too!)