People spammed it because the game was missing a content tag it qualified for.
The mods literally wouldn't have added the tag after it was reported as missing if it didn't qualify, they'll decline report attempts and put a mod note on the thread to inform all mods to ignore future reports of that nature if it kept happening, or put a disclaimer on the OP to not report it for the tag if they didn't stop after that.
The site has its own rag rules, they don't care what NTR is defined as for the genre (or, rather, what your personal definition is, since barely anyone on this site actually uses the real one), they made up their own criteria and that's all they check for.