Hi,
As the datasheet mentions SPT0_AD1 and SPT0_BTDV are multiplexed, and hence both these functionality cannot be used simultaneously.
But note that SPT0_BTDV is just a status signal for Multichannel transmitter and it depends on your application to use SPT0_BTDV. SPT0B Multichannel Tx can be used without SPT0_BTDV (with other pins of SPT0B).
Let me know if you need any more details.
Regards,
Punarva