The super-sukhoi programme will be done in phases. Once the operational life of the Al-31 engines expires, it will need a replacement.
Russsia has offered Al-41, but IAF has not shown any interest in that.
DRDO want to kill multiple birds with one stone. A 125 kN thrust engine will power AMCA MK2, TEDBF, LCA MK2 making them supercruise capable; as well as replace the Al-31 of Su-30mk1 as part of super-sukhoi programme.