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Reversible computing[1] allows us to use less energy than the von Neumann–Landauer limit of kT ln(2) energy dissipated per irreversible bit operation (note that our current technology is still many orders of magnitude from this limit). It does not reduce the energy requirements to zero.

[1] https://en.wikipedia.org/wiki/Reversible_computing

This is similar to how I reverse aging by walking backwards. Works like a charm! /s

how is that possible? breaks the laws of thermodynamics

The second law is only a statistical law. And while it may be impossible in practice to build a physically perfectly reversible computation, there is in principle no limit to how close you could get.

Reversible computing is a scientific topic of research: https://en.wikipedia.org/wiki/Reversible_computing

Yes it is.