Canon EOS D30 is reported with the wrong lens in darktable and no exif is printed at all in RawTherapee. I uploaded the raw file at http://exif.regex.info/exif.cgi and also that webpage wrote 70-200/2.8L IS II, but the lens attached was the 16-35/4L IS.
In Canon Digital Photo Professional, the lens is reported correct.
This is an exiv2 issue. LensFun can't do anything about this, it only uses whatever lens name the calling software passes to it.