The testing of 10kW low temperature e-cat is basic science.
I wish it was! That would make all of this so much easier. In a sane situation, you'd take a test that is criticized, and you'd do it over, taking any steps necessary to address the criticisms. And then you'd do it again. In an even saner situation, you'd have the thing tested as a black box by a laboratory that had no connection to Rossi. Instead we have a series of tests which have been impugned on various grounds and whose gaps were not filled in.
The first step in an arrangement with Rossi is to test that device. If you want to accuse Rossi of fraud you have to explain how he does it.
I have not accused Rossi of fraud. IH have, and they've set out the reasons in their Answer. You should take a look if you have not already. You might not find their reasons persuasive. That is a different matter.
In the last 5 years nobody here can explain how he deceived people in letting professionals measure a COP of 6.
Although this statement is too general to trace back to a specific test, let's assume for the moment that it's true. The next step, then, would be to follow up with further testing to address any complaints. Rossi is under no obligation to do this. But neither should he be surprised about the present outcome for making a big claim and then people complaining about it.
Gullible in what way?
Mats Lewan is overly hopeful and is not objective at this point. He and the Swedish team that did the Lugano test do not appear to be open to the possibility that they've made mistakes, at least not publicly. Hydrofusion is the most gullible, as they continue to court Rossi after evidence coming to light (an email from Rossi, which is an exhibit to the IH Answer) that he intentionally manipulated a test with them in order to scare them enough to back out of the deal, so that Rossi could proceed unencumbered to enter into a contract with IH. If I were them, I'd swiftly cut ties with Rossi.