An entity that has contradictory beliefs will be a poor instrumental rationalist. It looks like you would need to engineer a distinction between instrumental beliefs and terminal beliefs. While we're on the subject, you might need a firewall to stop an .AI acting on intrinsically motivating ideas, if they exist. In any case, orthogonality is an architecture choice, not an ineluctable fact about minds.

The OT has multiple forms, as Armstrong notes. An OT that says you could make arbitrary combinations of preference and power if you really wanted to, can't plug into an argument that future .AI will ,with high probability, be a Lovecraftian horror, at least not unless you also aargue that an orthogonal architecture will be chosen, with high probability.