premise: John von Neumann's Universal Constructor is a self-replicating machine in a cellular automata (CA) environment. It was designed in the 1940s, without the use of a computer. The fundamental details of the machine were published in von Neumann's book "Theory of Self-Reproducing Automata", completed in 1966 by Arthur W. Burks after von Neumann's death.
hypothesis: Burks used a computer to complete Neumann's book.
reason: We do not know whether Burks ever used a computer for any purpose, let alone completing Neumann's book.