You've heard right. His datasheet puts him in a different battlefield role then those used in a household detachment or an outhsworn detachment, so he can't be fielded using those. There are a couple of formations which call for night, but make no bones about the battlefield role of those knights, and Gerantius is still a knight, so he can qualify for some of those formations.
Of course he can also be taken in an unbound army.
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