The only thing it says (as far as Economy is concerned) is that the airline is not selling any more economy seats, even Flex+. I don’t really understand what you mean with ‘free economy seats’, but it can be interpreted as saying that Economy will be full! It’s the same for both flights. If you already have a Y Flex+ ticket (or are a Plat Skywards member), there is a chance of an operational upgrade. Impossible to say how good that chance is.