Oh dear - this seems to hark back to the Bellamy era.
Still, this bit is interesting....
"The complaint has been made by the player’s guardians to the FA nearly three years after the event and following a meeting with the club at which the club confirmed it would agree to release the player and that it would not relinquish its entitlement to training compensation should the player wish to join another club.”
In other words, they're trying to secure a better deal by trashing the club. As if it's not been trashed enough already.