Yes, you're right, but it's also important to combine with Landauer's principle that says that entropy loss (information deletion) actually costs nonzero energy

Yes, you're right, but it's also important to combine with Landauer's principle that says that entropy loss (information deletion) actually costs nonzero energy. Reversible computation doesn't. The idea is cool, but I don't know if anyone really thinks it's an issue relative to all the energy we currently use to compute (the quantities in the theory are negligible).