To be fair it's just SPI and a big package, super easy to read even centuries from now. I don't think we will somehow forget everything about basic electronics.
Lead time / effort / skills / equipment to access printed data after >200 years: zero / minimal / basic literacy / any light source a person can easily read by
Not everything, but there might not be any surviving copies of the datasheet around. It's reasonably close to generic SPI flash chips that you could probably reverse engineer it, but it's not a guarantee.
