Dear @Hassanali,
Welcome to the Wefugees Community and thank you for reaching out to us.
As holding a student residence permit doesn't "qualify" for a permanent residence permit (Niederlassungserlaubnis) in general and also doesn't "count" for the respective minimum years, I assume that he needs to hold the residence permit according to section 28 of the German Residence Act (as spouse of a German citizen) for at least three years before he can get the permanent status.
Am I right on this dear @mbeon-fardeen?
All the best,
Meike