The tag is present in Lintian version 2.104.263. That is the most recent version we know about.
This package appears to be the first packaging of a new upstream software package (there is only one changelog entry and the Debian revision is 1), but it does not close any bugs. The initial upload of a new package should close the corresponding ITP bug for that package.
This warning can be ignored if the package is not intended for Debian or if it is a split of an existing Debian package.
Refer to Debian Developer's Reference section 5.1 for details.