What is the ruling when the slanderer says, 'You committed Zina while you were a polytheist,' and the complainant claims the slander meant both Zina and the status of polytheism simultaneously?

Primary text

The statement of the slanderer is accepted, as the dispute concerns the intent behind the evidence, and the slanderer has superior knowledge of his own intention. The phrase 'while you were a polytheist' functions as a circumstantial qualifier (Hal) describing the state during the Zina.