So, you're parsing an RSS file and then, for each item, you are fetching the link. What you get back is HTML not RSS so no, I don't think you'll get far trying to process the links with XML::RSS::LibXML.
I'm not sure what you plan to do with the HTML documents but
you already have XML::LibXML loaded into RAM so you could use it to parse the HTML:
my $dom = XML::LibXML->load_html(
location => $fileName,
recover => 1, # handle marginal HTML
The parser options for load_html are documented in XML::LibXML::Parser.