Congratulations on your PC!
That is one way to sweat talk a CS. You got an APR reduction and an authorization to product change, nice. Now normally a product change would be allowed anyway but I guess the penalty APR is the thing that makes a mess for the computer and that was why it balked at first. Be aware that any rewards you had stored are forfeit in a PC unless there is a compatible reward structure(there isn't) on the new card and it is allowed to carry over.