You can compare that to the schematic of the original SSC-32 shown on the
lynxmotion page.
http://www.lynxmotion.com/p-395-ssc-32-servo-controller.aspx
I didn't trace every wire, but looks to me like all they did was take the original
board, and add an extra header connected to the RS232 RX/Tx pins and label it
APC&BT. Maybe you can find other differences, not my job.
To me, that doesn't make the board "Arduino", "BT", or "APC". It's just an
SSC-32 with an extra header.