If he GENUINELY wanted Chelsea, and knew they were in for him, he wouldn't be arsed about the wages i'd imagine. He'd get it sorted asap and leave.
Thats my opinion anyway. Theres no benefit to Chelsea staying away until the wages are sorted it won't change anything. I'm pretty sure Barca have told United they can talk to de Jong whenever they want, and if Chelsea were to have a bid accepted, then they'd say the same to them too.
I'm pretty sure Chelsea aren't as interested as is being made out in the Athletic. If they were, don't you think it would have been a bit more out there by now? Surely we'd have widespread reports, which tells me that the info the Athletic has is from Barca and not Chelsea.