The speaker says that for a long time the Maxwell’s demon problem lacked a very satisfying explanation, until Landauer argued that deleting information requires energy.

“which would break second law of thermodynamics. And for a long time I think there wasn't like a very satisfying answer for why that was the case, but then there was a more recent paper in the nineteen hundreds um more recently to us uh Landauer came up with the argument that you'd have to spend energy to delete information.”