The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
This package appears to be an aspell dictionary package, but it is not Architecture: all. The binary hashes should be built at install-time by calling aspell-autobuildhash, so the contents of the package should be architecture-independent.
Please refer to the aspell-autobuildhash(8) manual page for details.