Mizuno is saying that the physics is done. Only the engineering is left to do.
If this is true, then I urge Mizuno to publish an update to his papers describing how to build a reactor that produces excess heat. The problem with the papers published so far is that they have not really led to a satisfying set of replications -- it is really a pretty spotty record so far. So if there are new insights that would definitely improve the chance for replicators then I think they should be carefully written up and published forthwith.