Perl 5.004, huh? I think your problem is related to your perl version. So it can be that ${link} will always give a problem with a perl this old. Note that
link is a built-in function.
To get around your problem, I'd suggest using sprintf or printf. In particular, the first line, with the sub call, will look a lot cleaner:
my $link = sprintf '<a href="%s">', getQueryString('title');
printf "<th>%sTitle</a></th>\n", $link;
or something even more compacted.
p.s. you should really reconsider properly escaping these strings, for proper inclusion in HTML. The proper order is first URL-escaping, and next HTML-escaping the string. Perhaps you have already taken care of it, or part of it, in your sub, and I don't know what subs you have available for this purpose (it depends on the library you use), so I won't give the complete code.
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