It's plausible that it's talking about electrical energy (Escalator, Lift etc) rather than physical. Though yeah I get where you're coming from, would bother me also.
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Y'all are taking this sign too literally. It's pretty common to refer to electricity more generally as "energy."
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Isn’t it “cal” vs “kcal” (kilocalories), as in 1000cal?
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I think they mean electrical energy
Energy in = energy out.
This means even if you wanted to be environmentally conscious and take the stairs rather than using electrical energy to move the elevator, somewhere there is still energy being spent to create the food that's giving you that energy, and the electrical grid and elevator can do it at a way higher efficiency than you and the agricultural industry can, especially once multiple passengers are involved.
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Yeah sign is clear as mud.
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