Not Muslims by any account as far as the Quran and the Hadith are concerned. These people are way outside Islam. As far as I am concerned they are Munafiq.
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It is insult to Rasulullah (S.a.w) and religion of Islam to link Aga khan (and Agakhanis) to Islam.**
Sadly, this is the case. People have been blindly following since the beginning, be it material goal or in this case a human being who doesn't come close to represent a Muslim by name, forget representing the beautiful sunnah of our Rasulullah(saw)! The ordinary man who prays 5times a day,, represents the sunnah of Rasulullah(saw) more than Aga Khan. May Allah guide them.