The author's sentence is essentially a truism, because fiddling with information _as such_ and in theory doesn't use up any energy. As practically implemented in current CPU electronics, though, information needs to be communicated from point A to point B as a change in voltage. To convey that voltage change means having to move some amount of electrical charge into or out of the tiny capacitor that is a transistor's gate, via the non-perfect conductor that is the doped-silicon trace between the two points. Resistance saps part of the energy moving those electrons around and converts it to heat.