You need to report it to HTML::Parser bug tracker. Cpantesters results are only reports, in many cases automatic, so to gain attention of author you need to use bug tracker.
P.S. Upgrading is also a good idea (in case you have no problems of doing this) - Perl has changed much in 9 years from 5.6.1.
Alexandr Ciornii
2010-02-17 19:12:41