The question was a straw man. It is not the IH claim that "Rossi was never able to generate excess heat for IH." They claim that he did not successfully teach them how to make devices that worked, that they were unable to "verify" his technology.
Abd, your answer is another straw man. As I read it, it says 'did Rossi generate excess heat for IH'? In other words, did they see what they believed to be XSH. Nothing to do with their court case. It is my belief that there were a number of tests performed in Raleigh that IH thought were good enough to induce them to part with more cash. These tests involved at least one melt-down, so something was getting hot - in my experience you can't get Kanthal hot enough to melt Alumina. So IMHO, the answer should be 'yes, he probably did'.