No, this is not sufficient, since it would still allow you to swap to shite ram of the same size. This is an age-old problem for counterfeits. The ink on the chip/PCB isn't worth anything. The only way to actually catch this is to do a IQC that runs a full RAM test and hope that if you can't see a difference in performance (throughput, BER, timings, etc), then the chip is correct, with a bit of periodic de-lidding for anything suspicious/sampled. Then, if you can afford it, you blacklist the vendors that are caught changing things.

They also added a bit of internal ink, which is worth just a little more:

> we now also program in some other device attributes, meaning that switching parts of the same size may not work.

Working with vendors in China is entirely adversarial (mostly because their supply chain is vulnerable too), at this scale.