I think the A14 is layered over LPDDR4X, not LPDDR4 as this article currently indicates. Your previous teardown of the iPhone 11 Pro shows the A13 over LPDDR4X and the teardown of the iPhone XS shows the A12 over LPDDR4X. It is unlikely that Apple has reverted to LPDDR4 for the iPhone 12 Pro.

The Micron MT53D512M64D4UA chip is better described as an LPDDR4X SDRAM.  According to the Micron DRAM Component Part Numbering System the MT53D prefix decodes to (MT = Micron Technology, 53 = LPDDR4, D = 1.1V Vdd / 0.6V Vddq),  LPDDR4X is identical to LPDDR4, except that the I/O voltage (Vddq) is reduced to 0.6 V from 1.1 V, which appears to be the case for this chip.

Shouldn’t the A11 be identified as a SoC, not a CPU, with model number of APL1W72 instead of 339S00434?

I wonder if the Apple 338S120L might be the M7? It's about the right size and proportions, assuming the illustrations and comparison between the A7 and M7 in the keynote video were to scale. Alternatively, I suppose it could be an replacement for the Apple 338S1117 (Cirus Logic audio codec) from the iPhone 5, assuming the Apple 338S1216 is the replacement for the Apple 338S1131 (Dialog power management) from the iPhone 5.

I also notice that the gyroscope chip (STMicroelectronics L3G4200D) that was in the iPhone 5 seems to have vanished.