I think the point the parent comment was trying to make was, consider if you are storing data in North Korea; it’s 2010 and your encryption scheme is considered secure.

At some point, North Korea has copied the encrypted data for later data mining.

In 2021 that encryption scheme for some reason is no longer considered secure. Even if you stepped using it in 2014, the data from the time you used it up until you stopped may be compromised.