The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
As of menu, version 2.1.25, /usr/lib/menu as location for menu files is deprecated (but still works perfectly). Menu files should now be placed in /usr/share/menu instead. Only menu files that are actually binary executables still need to go to /usr/lib/menu.
Please refer to Debian Menu System section 3.1 for details.