Does Diablo16 display modules support CANBUS?

No. Diablo16 display modules do not directly support CANBUS.
However, you can use MOTG-CAN to connect a Diablo16 display to a CANBUS. This will require one of the configurable SPI bus.
When using a gen4-uLCD Diablo16 display. It is advisable to use gen4-MOTG-AC3. This allows easy connectivity with the MOTG-CAN through Diablo16's SPI.