I have tried simulating a senior fare ( assuming senior with card will be the same price as weekend card if rule of weekend is respected)
By example for a flight to ATH the 7/8/21 with 7.10 am departure and return the 14/8/21 with 7.55 pm departure : light fare is 1414 € and senior is 1342 € ; this is a good saving you can achieved; On return flight in France in the cheap fare the saving is 5 € by segment. Today benefit is limited for Silver and above as we have 1 free luggage anyway and free change and cancellation until end of 2021; In most case you will need probably more than 4 flight eligible over weekend to get benefit from the card.
The card will become more interesting in 2022 with the benefit to change flight for 10 € and cancel for 20 €;
It seems to work also with connecting flight via AMS.