It's just a fancy form of delay-line memory [1].
[1] https://en.wikipedia.org/wiki/Delay-line_memory
In a universe with mass–energy equivalence, show me a storage medium that isn’t effectively a delay line :)
you beat me to it - or https://en.wikipedia.org/wiki/Delay-line_memory in general, space is probably closer to an electrical delay line in practice.
In a universe with mass–energy equivalence, show me a storage medium that isn’t effectively a delay line :)