High boost/prime question

I have a 2009 SR22TN. The POH says that High Boost/Prime will automatically shut off if the oil pressure is above 10psi (Section 7, page 40). But then in the Tornado Alley Supplement (pages 14, 15 & 17) it says to use High Boost/Prime above 18,000 feet under certain situations while the engine would be operating above 10psi (and thus not functioning).

This doesn’t seem to make sense. Does anyone have an explanation?

That’s in the standard part of the POH. Anything in the supplement overrides the base POH. The prime/oil pressure interconnect is removed when the TN STC is installed.

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thanks for clearing that up for me!