There are no links, ...

There's some history to that issue (PDF, annotation method using Perl, Perl PDF format issue., URL issue with PDF::Table), which the OP forgot to mention.

In short, PDF::Table doesn't have a "cell_render_hook". This is a patch I suggested in response to the original question. In other words, without the patch you of course don't get any links, as they're being generated within that callback function...