The problem i have comparing this to europa is europa isn't earth. Earth had evolved life and changed before this water was iced over, sure the stuff there has been isolated for a long long time but it is not the same as a completely different planetoid with 60 mile deep oceans orbiting a gas giant.

Until we go there and drill into those oceans and explore them we won't know obviously but I wouldn't compare it to any part of a habitable planet, especially given the changes in its geography.