The tag is present in Lintian version 2.109.6. That is the most recent version we know about.
The listed target in debian/rules is a likely misspelling or it is
missing an underscore ("_") between the
execute_after_dh etc. and the command name.
This can result in (for example) a
silently not being executed by
Implementation detail: The typo is detected by using "Levenshtein edit distance" so if the typo involve several characters Lintian may not detect it.