The AD5291 datasheet is confusing on the topic of VDD voltage range.  Is it +9 to +33V or +21 to +33V?

The Features section of the datasheet states a VDD voltage range of +9 to +33V, yet the General Description section restricts it to +21 to +33V.  Which is it?

I have a battery powered application where only 15.4V to ~18V are available for VDD [VSS = 0V] {two 9V [7cell] NiMH batteries in series}.  To meet a minimum requirement of +21V would complicate the design.

Can someone with authority please verify the correct VDD voltage range?

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