I thought it was a load of rubbish myself, and largely uncorroborated.
The part I'm inclined to believe is that the club reacted badly to the discovery that Song was being pimped by Dein on the market with 3 years left to run on his contract.
I believe that happened because rumour and leaks seem to agree with it, and if it did it was an act of very bad faith by both Song and Dein. That's not how you squeeze your employer for a raise.
Our response in selling Song is interesting though, and it's not something we had to do.