This /etc/init.d script indicates in its LSB headers that it provides a virtual facility, denoted by the dollar sign in front of the name.
This is not the correct way to provide a virtual facility. Instead, the package should include a file in /etc/insserv.conf.d, usually named after the package, containing:
to declare that the named init script provides the named virtual facility.
Refer to https://wiki.debian.org/LSBInitScripts/DebianVirtualFacilities for details.