You mean the availability... yes i have read same long time ago and there was the issue with shelf life of their Russian AAM R73 & R77 etc.Their FLANKER serviceability is very low. I think 55-60% maximum.
As well Indians are preparing to buy BVR derby from Israel for SU and meteor from France for mirages and Rafael.
Integration of derby can be tricky because Russian support would be required. May be India is trying to re-approach Russia with this new 2.7 billion deal and buying Russian made SU to compare them with local made... could be many objectives of this one deal, linked to future buildup plans of InAF.