Short, because there is not much to say, and specific, because vagueness in a page like this is the problem rather than the solution.
The email conversation itself stays in the mailbox, the way correspondence does, so that a question you ask three weeks later can be answered. A copy of the report is kept for the same reason. Your manuscript is not part of that.
If you would rather nothing at all remained, say so in your email and the whole thread is deleted once you have the report. That is not a special favour, it is a line in a reply.
These pages carry no cookies, no analytics, no tracking pixels and no third party scripts of any kind. Nothing is loaded from another domain. There is no contact form: the buttons open your own email program, which means nothing reaches anyone until you press send in a program you control.
Most of the files that arrive here are unpublished. That is treated as the default rather than the exception. If you want a signed confidentiality agreement before sending anything, ask and you will get one, and a diagnostic is not worth less for having been asked.
Maktabi Suite SARL AU, Casablanca, Morocco. Contact: maktabisuite@gmail.com. Write to that address to ask what is held about you, or to have it removed.