The pressure was a little high. I do not know if it was well conducted. I would have to see more details. Anyway, one test does not tell us much. Mizuno did this for a while before it worked. As noted in the previous paper (https://www.lenr-canr.org/acrobat/MizunoTexcessheata.pdf), it produced ~12 W excess at first, and very often no heat at all. A person trying to replicate who is lucky might see 12 W after several months of effort, and then might gradually learn to ramp it up. I would be astounded if anyone achieved the high power results shown in Table 1 at first. As I said before, that would be a miracle, not a replication.
In any sort of laboratory investigation, having to hunt for the settings that yield optimal performance is pretty common in my experience. In the hunt, one overcomes a thousand and one difficulties almost without realizing it. This is a problem for replication because published works usually describe the final working procedure rather than all the troubles encountered and solved during an investigation. The typical way around this in academia is to send a student for a couple of months to someone's lab where a technique is already working. Hard-to-state knowledge is transferred by some form of osmosis and is then more readily transferable back to the home lab. I don't know if a visiting replicator position would be possible in Mizuno's situation, and it would be a big ask from replicators who are for the most part not externally funded, but it would be beneficial if it could be arranged.
In the absence of a personal visit though ... can you, Jed and Mizuno, look back and suggest any as yet unpublished move that helped to boost small and unreliable effects into something substantial?