My point is, if you can’t even get someone else to reproduce your experiment then you can’t mass produce the thing because you can’t describe how to reproduce it.
Manufacturing involves reproducing things on a mass scale.
So the fact that it can’t be reproduced doesn’t necessarily mean that it isn’t happening, just that you don’t understand it well enough to be able leverage it for any application and you absolutely can’t mass produce a product using it.
And your point is simply wrong. See my discussion of crafts guilds. They reproduced a great may and greatly complex items with no written instructions or theory of any sort.
What you are doing is confusing scientific reproducibility with engineering repeatibility (to use the specific terms correctly). What Rossi has apparently gotten is engineering repeatibility (that is, he can reproduce multiple items that work the same way), even if other groups without his "recipe" cannot. This is perfectly sufficient to have units to sell. And is legitimately done in all industries under the guise of "trade secrets".