I'd guess they have an outgoing lined up for the transfer window then in terms of getting under the salary cap or whatever the system is in La Liga. And multi billion businesses taking out big loans to get capital moving isn't that unusual. It's something that a lot of clubs in varying degrees of financial health do. Pure guesswork from my point though.
I think the point still stands that they have been affected by Fair Play and La Liga's own restrictions though. They certainly haven't ignored it.
Veering wildly off topic though so I'll pipe down now