I cannot imagine a stronger "proven negative" than Exhibit 5. If that does not convince you the results are garbage, nothing will.
Jed, THHuxley agrees with you that Exhibit 5 is convincing that the measurements are garbage. That doesn't automatically mean that there was zero excess heat.
Since the results are garbage, we can't know for sure that there was zero excess heat.
For me personally, I'm highly skeptical that there was any excess heat, and it seems highly likely to me that Rossi is just a con man faking everything. But I can't be absolutely sure (ironically) because all I know for sure is that his data is garbage (and that he's a liar). THH would likely state, like me, that if you (Jed) or any other truly independent and competent engineer were given $20,000 to measure the COP and came up with no excess heat, that would convince me beyond any doubt that the E-Cat has not excess heat.
Since that hasn't happened yet, there is some slim possibility that there is some small effect despite Rossi's garbage measurements and con-man ways.