What information does "INFO" provide?

Hello Gregory_Conestoga ,

having been a student myself and writing theses in several versions myself, the editing time can be very short - especially for the clean and final copy I wanted to send out. So your assumption is essentially correct, but the assumption of plagiarism behind it may not be justified.

For more information, these articles might be helpful:
How to Tell How Long You’ve Worked on a Microsoft Word Document (howtogeek.com)

This one also mentions the privacy infringement connected to this information:

What does "total editing time" track in Microsoft Word? - Microsoft Community

To your next question: I assume this might be due to the fact that they worked on computer that doesn't have the "author" or the "owner/administrator" account set-up and therefore it shows the generic code.