Yea ok I am going to believe some random persons statement that ones daughter marrying an Ahmadi = Being Ahmadi. If you're going to make something up, don't come up with outlandish reasoning.
He is confirmed Ahmedi though he might not admit due to certain complexities in the Constitution of Pakistan which dosent allow PM of Pakistan to be Ahmedi but he was interim so might be this rule is not applicable to him.
His news of PMship was made a lead in Newspaper Al-Fazal , only newspaper of Ahmedis in Pakistan published from Rabwa .I also have read this newspaper a lot.