Hi Antoine, I'm currently thinking about missing bits for a 0.9.33 release. I didn't switch a package to dfsg source before, so I'm new to that.
It looks like it should be documented in debian/copyright, e.g. why the source tarball was repacked and what is the reason. There should be a changelog entry, which also refers to this bug. Furthermore, I guess that the procedure to create the upstream tarball should be described, by providing the script that I used. This could be done in a README.Packaging. Please let me know if I am missing something. Regards, Tino