I might be wrong, but this seems to enable the EZ-Key UART based protocol (a custom binary protocol), while the Bluefruit LE UART uses an AT command based one (e.g. "AT+BLEKEYBOARDCODE=00-32-32....".
There is code in the tmk_core/protocol/lufa/ folder for the Adafruit BLE based protocol, but over SPI instead of UART.