Hello mrtientv6,
1. 'NPI Process' refers to the New Product Introduction process, which means the product is still in the early stages of development and not yet available for general purchase. 'Contact their FAE' means you should get in touch with your Field Application Engineer (FAE) who is responsible for providing technical support and guidance for NXP products. They can help you with any questions or concerns you may have about the product.
2. Regarding the S32K358 Battery Management Unit (BMU) board, it is true that it does not include LIN and ETH interfaces. However, you can consider using additional adapters to add these interfaces to your setup. For example, you can use the TJA1101 automotive Ethernet adapter, similar to the one used with the S32K148-Q176EVB. Please note that you may need to make some modifications to the hardware and software to ensure compatibility with the S32K358 BMU board.
For more information on the S32K3 boards and available resources on NXP website.