Ecomm means any online transaction. The offer is for both online and offline spends so they added the condition that atleast one online transaction should be made.
I think Mobikwik give 6012 MCC for financial institution merchandise... Airtel(not personally tested) and SBIUnipay(tested) give utility MCC 4900 so cc payment on those apps should be fine. This is great.. 5% cashback on cc payment of 2L for pioneer 😎