The unit whisked away into the Realm of Chaos counts as being slain, I'd say that the Green Knights ability to come back is still in effect. Infernal Gateway does not say anything special about this case. What is the wording on the Knight's ability?
The rule on Aura of the fey sates that the green knight can never truly be slain and when his wounds are reduced to zero he disappears into the airand in the remaining movement phases he can be re awaken.
So since infernal gateway removes models from play counting them as slain it would seem that he can be reawaken since infernal gateway removes models counting them as slain and not just simply removed from play.
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