Perhaps there were relegation clauses in many players contracts that stipulated wages would be reduced and as compensation, release clauses added and these were activated immediately on relegation. Then when the new owner and management team came in they sat down and negotiated with certain players that wages would not be reduced and the original contract reinstated.
Perhaps Gana was one of these and this is why there is anger at Villa in that he has gone back on this and why there is talk of wanting more money for him on the basis that there is in effect no buy out clause and the media are using old facts about the clause. Also, perhaps Gana's agent is using it as a bit of a smoke screen with the media.
Obviously, this is total speculation.