Although gimp-data-extras is an official RedHat RPM package, an 'rpm -qi gimp-data-extras' shows that it claims to have been packaged not by RedHat but instead by 'Trond Eivind Glomsrxd <teg.no>'. Presumably there is an explicit Packager: in the RPM spec file that RedHat is using. It should probably be removed.
This has been verified.
Trond originally packaged it and we haven't significantly changed it (just rebuilt it, as far as I can tell) since, so why take away the credit from a clueful packager? We tend to remove the Packager line if we make significant changes to the package. We make significant changes to many packages, so very few packages have a Packeger line in them.