Quote: Gronk! "Why would Cas give a team permission to talk to one of their home grown players they will want to re-sign themselves?'"
Correct.
Unless Joe Arundel has said in no uncertain terms that he will not sign for Cas.
Regardless of that, Cas have released a statement on Twitter advising it was due to an internal human error and that Joe is a Cas player and is in talks for a new deal.