From the abstract, the idea is that we can continue to shrink: "...in a manner in which no thermodynamic entropy is created or passed to the surroundings."

The objection seems to be the "free lunch" assumptions being made about shrinkability.

"What Is TANSTAAFL?" https://youtu.be/ZrZUe7R44eA?si=oK2H1L9ha1zQhDOh