قَدْ تَحَقَّقَ الْوَعْدُ أَمْسِ.
The promise was indeed fulfilled yesterday.
“Qad” with a past verb can reinforce that the event was realized, while “amsi” specifies its time. Since the outstanding question concerns time, “yesterday” is the crucial answer. Reinforcing occurrence does not itself provide the requested temporal information.
Removing “qad” preserves the time of fulfillment while reducing a possible emphatic nuance. Such a small revision illustrates why the analyst must separate the content of a report from the strength with which its occurrence is asserted.