The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
The specified init.d script has no systemd equivalent and the package ships other units.
This typically occurs when a maintainer missed script when adding systemd integration, or a new init script was added in a new upstream version.
Systemd has a SysV init.d script compatibility mode. It provides access to
each SysV init.d script as long as there is no native service file with the
same name (e.g.
/lib/systemd/system/rsyslog.service corresponds to