The tag is present in Lintian version 2.104.244. That is the most recent version we know about.
The symbolic link has needless segments like ".." and "." in the middle. These are unneeded and make the link longer than it could be, which is in violation of policy. They can also cause problems in the presence of symlinked directories.
If you use debhelper, running dh_link after creating the package structure will fix this problem for you.
Refer to Debian Policy Manual section 10.5 for details.