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LM66100: Need for FET on a Input Polarity Protected part?

Part Number: LM66100
Other Parts Discussed in Thread: TIDA-010224, , , TPS22919

Referring to TIDA-010224 - Low-Power Wireless Camera Reference Design

I see there's (Q1) SI2323DS in front of (U3) LM66100DCKT input pin

LM66100 datasheet describes it as "5.5-V, 1.5-A 79-mΩ, Low IQ Ideal Diode With Input Polarity Protection"
Why Q1/FET is needed/ used in addition to U3's Input polarity protection?

I see it (the FET) is not used in LM66100EVM - so even more curious...

Please advise. Thanks.