This route seems to be completely sold out in all travel classes today and for the coming days. So I am guessing that means oversold. If there are unserviceable seats, then that makes matters worse. So if I were in the OP's shoes I would be hoping that my new seat at the back of Club sticks! Some unlucky ones might not have any seat!
Agreed. Less rant
my colleague wasn’t shifted and didn’t pay so she finds it most amusing!