The Sulaymani Dai doesn’t claim infallibility

The dai for Sulaymani Ismaili/Fatimid Mustalian is al-Fakhrī ‘Abdullāh ibn Muhammad al-Makrami. He is situated in the modern day Saudi Arabia (in the old days it was part of Yemen). He has a representative in India for Sulaymani Bohras (their number is very low and is fast dwindling because many are re-aligning with the Daudi. They are also some who is no longer in touch with their mission while many of them have intermarried with non-Fatimid Mustalian sect).

The infallibility (isma) for the Dai (agent of the Imam/preacher) is something that was added much later (after the Sulaymani splits).