this post was submitted on 19 Feb 2024
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Privacy
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I was going to suggest an attack similar to what I'd assume the guys in your link achieved—the actual data on the flash chip can be dumped easily, so if you can figure out the encryption algorithm used, you don't need a whole lot of computational power to brute force a 15 digit numeric key (a couple of high end GPUs would probably get you there in an hour or so) and decrypt the dumped data.
I'd stop short of saying "easily" since you have to get the epoxy potting off of the chip. But you are right that there doesn't seem to be any active tamper reactance. The numeric key is apparently 8 digits. Since it's a 10 digit keypad, at least 2 of the digits are unused, and you might be able to recognize those from the comparative lack of fingerprints and wear on those specific keys. So that narrows down the search range some more.