That would all be fine if it works as trivially as you suggest. However the OP and I both had the same experience trying to use the tool as described in the module's documentation. I had Doxygen installed. I followed the instructions in the POD (to the extent I could - see below). A doc folder was created where I expected it to be and there was an index.html file where I expected it to be. When I opened the index.html the page shown was essentially empty. By following the manual steps I described I could get Doxygen to generate the documentation I expected.

There is a gap between the process you describe and what the OP and I experienced. Maybe there is a configuration setting somewhere that we have missed, but if so it is not clearly documented and you haven't mentioned it. I searched the Doxyfile for any Perl related configuration information that may be pertinent, but didn't find anything. Note though that there was no Doxyfile installed to the bin folder containing the doxygen-filter-perl script or in the Doxygen::Filter::Perl context, which were the only places I could think of to look in response to the "Copy over the Doxyfile file from this project" instruction.

It would help a great deal if there were documentation for any special content in the Doxyfile that is pertinent to using Doxygen::Filter::Perl. It would probably also help if "this project" were rather less vague as on reflection this is most likely where things have gone pear shaped!