You know very well i understand all the issues you raise. You just don't want to admit that missing a X9 error is just a tad laughable
They didn't miss it. It wasn't an error. They saw that according to Rossi's method the cell was apparently producing 9 times input, but they also knew was an error, because the cell was empty. They pointed this out to Rossi. He got angry.
They made errors in previous tests which they thought produced real excess heat. However, I have not read that these previous tests produces errors as large as 9 times input. I think the previous errors were smaller. I believe I.H. realized there was a problem so they tested a cell with no powder and pushed the technique to its limits to get 9 times. That does not mean they believed it.
In the 1-year test, Rossi and Penon produced an error of 50 times input. They made 20 kW look like 1 MW in their own data, mainly by producing hot water and claiming it was dry steam. However, I do not think this was a mistake. Given the absurd numbers in the report and the absurd choice of instruments, I assume this was deliberate fraud.