Are Nizari Ismailis (followers of the Aga Khan) considered Muslim and tahir? They don't pray the 5 daily Salah like us because they believe their Imams abrogated it and replaced it with daily duas they recite. They believe other aspects of the shariah have been abrogated as well.

As long as they believe in the Qur’an, the Prophethood of Prophet Mohammad, and they consider themselves Muslims, then yes they are treated as Muslims and would be pure. They are deviants but they are treated as Muslims