Paperbak?

https://en.wikipedia.org/wiki/Flash_memory

Yes

Oh that’s interesting and might be an issue with the OP’s 50 year time line

This is not a question about how long data I put on the SSD’s will last.

Counterargument, you actually ARE. For example, the firmware is also stored on flash (albeit it’s NOR instead of NAND as far as I know).

I have absolutely no clue how long NOR flash lasts, although I have heard anecdotally that it is much more reliable (and more expensive) than NAND. Hence why SSDs use NAND for mass storage, and use NOR for shit like firmware.

Is there any reason they won’t work after that amount of time?

Without that firmware it’s not gonna do a whole lot lol. So I don’t have an answer to your question, but I feel like it should also be considered.