Due to the timing of the announcement (potentially the last announcement to be made explaining a player has left) I think it's fair to say he's been offered a contract of some sort. Therefore, it'd be fair enough to say he's decided to go elsewhere. If it's been his decision to leave, the statement we've published is fitting and apt.
I don't know what you expect, Trump. A video across the social media platforms with the hashtag #AnnounceCardle'sDeparture ?