Hello @ZJoe ,
Looks like you have there an MPC5744P rev E. This board have a different Serial instance routed to the onboard USB2Serial.
To be able to download the code directly from Simulink on your board, you have to flash another bootloader, the MPC574xP_S32DS_UART0_CAN0_OpenSDA_RevE.rbf

Can you please give this a try?
Regards,
Marius