Remember when Arsenal offered the release clause +£1 for Suarez and Liverpool said no because that wasn't really exceeding the release clause? A couple of years later a Liverpool official said they were concerned Suarez and Arsenal would challenge that legally because they knew full well that it did exceed the release clause, and they'd have lost in court.
Likewise Barcelona will be just trying it on with the date thing out of desperation. It buys them a little bit of time and leverage to try to talk him round but I would be absolutely astonished if they were prepared to fight it all the way.
Wasn’t it just that it allowed them to talk to Suarez who duly told them to do one