WHo are Agha Khanis? Why are they not considered Muslims?

https://www.articsledge.com/community/general-discussion/who-are-agha-khanis-why-are-they-not-considered-muslims?fbclid=IwY2xjawEzhaVleHRuA2FlbQIxMAABHRDmMBLeOUITaOxFcTfjAwApqJoaKjza2as2aweM3dcaSdzOAchOw_XkYA_aem_b0L6NxyPbQdAQDLFvknKvg