If you disagree with much of IABIED but are still worried about AI risk, maybe the question to ask is "will the radical flank effect be positive or negative on mainstream AI safety movements?", which seems more useful than "do I on net agree or disagree?" or "will people taking this book at face value do useful or anti-useful things?" Here's what Wikipedia has to say on the sign of a radical flank effect:

It's difficult to tell without hindsight whether the radical flank of a movement will have positive or negative effects.^[2] However, following are some factors that have been proposed as making positive effects more likely:

• Greater differentiation between moderates and radicals in the presence of a weak government.^{[2][13][14]: 411}As Charles Dobson puts it: "To secure their place, the new moderates have to denounce the actions of their extremist counterparts as irresponsible, immoral, and counterproductive. The most astute will quietly encourage 'responsible extremism' at the same time."^[15]
• Existing momentum behind the cause. If change seems likely to happen anyway, then governments are more willing to accept moderate reforms in order to quell radicals.^[2]
• Radicalism during the peak of activism, before concessions are won.^[16] After the movement begins to decline, radical factions may damage the image of moderate organizations.^[16]
• Low polarization. If there's high polarization with a strong opposing side, the opposing side can point to the radicals in order to hurt the moderates.^[2]

Of course it's still useful to debate on which factual points the book is accurate, but making judgments of the book's overall value requires modeling other parts of the world.