Exactly my thinking, if he is that keen to stay at Barca then we didn't loose anything except our time.
It would be good if the current terms offered was leaked so we have an idea whether Barcelona are purely bullshitting.
Maybe Barca are waiting for De Jong to get back so they can tell him.
"ehh hemm, we appreciate you a lot here Frankie! But you know our financial situation, we can't afford your wages, here's a new deal with 75% deduction.....wait! wait! wait...
Maybe but all the top sources reports a fee is already agreed, just the structuring and terms of the add ons remain, from there you'll expect things to move very quickly. I've never known a transfer like this one.