There are some questions rising in french aviation press at the reading of Rippert's book.....
- The first one is: why did he wait so long before declearing this victory ?
- Then why no record of this event can be found in Luftwaffe archives of this day ?
- Rippert's log book cannot be found (...or no input of this day)
I haven't read this book myself, and I wouldn't dare to doubt about Rippert's genuine report, but maybe the book's editor decided some modification for a better "scoop" effect.
It is difficult to check the basis of these questions, but I believe that a deeper investigation is required in order to make the difference between a fiction book and an historic report.