Returns are in Indian Rupees, so whenever Rupee depreciates against the Dollar, returns will increase and when Rupee appreciates against the Dollar the returns will take a hit.
Motilal Oswal AMC has stopped fresh investments in this mutual fund due to industry hitting overseas investments limits set by RBI. Hence it is not available for purchase. You can learn more on this here: Everything you need to know about restrictions on new investments in international mutual funds and ETFs