These are not valid tags.
By definition if it's imminent, impending, or implied it's not actually in the image.
Therefor, it isn't TWYS.

Implied maybe, but imminent and impending can both be visibly depicted.

Also, TWYS includes text so things can be implied that way now that I think about it

regardless, it isn't visible in the picture being tagged
TWYS isn't tag what may happen next, or even tag what will happen next

As for implication in text form, it's still a potential future result, not something visible in the image that is being tagged.

You cannot see an implication, only infer it.

Good idea, let's remove also i'm_so_gay_i_shit_rainbows In most pics tagged with that there is no scat, and we can't really see that reason of shitting is being homosexual. Not TWYS.

But seriously, I believe that imminent_rape was not meant to be serious tag, and shouldn't be treated with TWYS. On the other hand there are way too many imminent* tags with only few uses.

If that one is supposed to be one of the joke-ish tags, that's fine.
But there's more than 20 other imminent* tags, and were about a dozen each implied* and impending* tags that wouldn't fit into that category.

Edit: it's also very poorly applied, there are numerous pictures that aren't in any way showing that rape is about to happen, and some where it's already happening but they tag it as imminent_rape for some reason.