Regarding
https://e621.net/post/show/802700
and its child posts.

This image is not relevant to the site, but can't be flagged as such.It is not remotely furry and belongs on more hentai focused sites such as danbooru or gelbooru

Because deciding what's relevant to the site is not your job.

Is the mentioned post relevant to the site?

Pendraggon said:
Is the mentioned post relevant to the site?

It's almost certainly not getting approved, so a deletion request would be premature anyway.

Pendraggon said:
Is the mentioned post relevant to the site?

No

You can add the not_furry tag to the post and your blacklist. I think these posts should just be deleted, but that's the admins' call, not mine, and users can always just blacklist the tag.

The admins already check every picture for approval. If they find a picture that isn't relevant, they'll remove it then. That's why flag reasons are for inferior posts, edits, two year rule etc. which aren't as easy to see.