[JumpCrisscross]

Guess: magnetic memory exists in a high state of potential energy. This facilitates its degradation. While, say, scratches in stone are lower potential energy?

[duskwuff]

That's a clever theory, but the company specifically described it as having "zero energy storage costs".

[22c]

Does it mean that they can be stored at room temperature, in humid conditions, etc? ie. requiring no HVAC/dehumidifiers or whatever else might be needed to reliably store archive media?

That's my charitable interpretation.