Even the most puritanical reviewer will accept a hardcore PenisBot recip because they know it's a strong traffic source. It's just good business.
To answer the first question, this:
Quote:
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Hardcore banner, image, counter or link to another porn site on your index page.
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does not appear to imply that all of those things are wrong. Notice the word 'or'. Sounds like they have a bunch of options all lumped together and that's the one they selected without indicating which one is the precise reason for rejection. You know whether or not you're using a hardcore banner. You know if you'r eusing a counter. If it's not one of those two reasons, then you are linking to another list or promoting a sponsor that they have banned.
That's my guess.
And now my aside. People who don't allow hardcore on the index page need to lay off the crack pipe. Child-friendly warning pages would only make sense if Google only indexed index pages. Don't submit to them.