The tag is present in Lintian version 2.109.22. That is the most recent version we know about.
The given runlevel specified in the Default-Stop keyword of the LSB
keyword section of this
/etc/init.d script isn't one of the
recognized standard runlevels (0, 1, 2, 3, 4, 5, and 6).
Please refer to https://wiki.debian.org/LSBInitScripts for details.