What extra premise is required for a corporealist inference from Qur’an 20:5?

Refuting Anthropomorphism: Divine Attributes, Scriptural Language and Likeness

• Treating every possible lexical meaning as equally definitive
• Keeping transcendence in mind when reading istiwāʾ
• Assuming the expression necessarily denotes creaturely physical positioning
• Allowing a possible nonliteral Arabic sense