That's not great but if by "free date change" they mean you can move to any other date with no change in fare then actually that's fairly generous in comparison to what a lot of other airlines are offering currently - plenty are not even offering that but instead only vouchers which are difficult to use or a move to another date for free but subject to additional charges if the fare is more expensive. A lot of airlines are currently trying to get away with not offering refunds - you might have to pursue a credit card charge back for a refund.