The best business lounge so far! Kudos to my CC

Got access to Encalm Prive, a business class lounge, best in India in my opinion. (T3, Delhi)

Axis Vistara Infinite

Only business class passengers get access here?

Business class or Star Alliance Gold/Platinum level (i got it via AirIndia gold)

if you are traveling non-Star Alliance (let’s say Indigo, internationally) do you still get to access the lounge via the card?

No. This one specific is only for business, first class or if you have a gold membership for the airline you are flying on.