1. Should Apple M2 processor support LPDDR5? Why is it two LPDDR4 chips?

2. The chip marked is yellow color should PMIC for Apple M2 processor. Is the Ethernet NIC from Broadcom? There is Broadcom BCM577xx on the mainboard

Likely Apple Thunderbolt 3 redriver

-> if it is apple design, the chip marking should be with Apple logo or with Apple's part number such as APLXXXX/33XSXXXX etc. From the the chip marking, most likely, it is is customized part from existing suppliers.

Do you have Chip Identification for audio board?

Any idea about the vendor of audio codec is? Still Cirrus Logic?

Will you have MacBook Pro 16" 2021(Apple M1 MAX inside) Chip ID?

Is barometer still Bosch’s solution?

Refer to Step 7,

There is no WiFi/BT chip on the main board. Instead, Apple uses USI 339S00761 WiFi/Bluetooth module .

8Gb is the capacity for single GDDR6 chip. There are four 8Gb GDDR6 chips. Total video memory capacity is 32Gb(4GB).

it is ST33G1M2 from STMicroelectronics. On the PCB board, it is next to intel PMIC.

339S00458 is much likely WiFi/BT module.