أَتُنْكِرُ أَنَّ الْوَعْدَ قَدْ تَحَقَّقَ؟
Do you deny that the promise has been fulfilled?
The interrogative hamzah makes this a question. Depending on delivery and context, it could genuinely ask about the addressee's position or rhetorically challenge an alleged denial. The particle alone cannot establish that the question has an inkārī force.
The answer “I do not deny its occurrence” responds to the suggestion of denial. The reply itself supplies evidence for the communicative function of the question; analysis should treat the entire exchange as the interpretive unit.