You are highlighting the opinion of a few experts who are committed to LENR and have strong views on this issue. They have views different from other experts not so committed. In this situation appeal to experts is not helpful.
Ah, ha! YOU just committed a Fallacious Appeal to Authority logical fallacy. A textbook example.
Look carefully at the statements made by these "other experts" you have in mind. You will discover they have not read the literature on cold fusion, they do not know what was done in the experiments, or what is claimed about them. They do not know, for example, that cold fusion experiments have produced 50 to 150 MJ from a few grams of material, at power levels of ~100 W. Without this knowledge, they are in no position to judge the results.
In short, these people are not experts. I do not think you will find any scientist who has actually read about the experiments, and who knows the facts about them, yet who doubts that the effect is real. Except Dieter Britz. The ones you are talking about are not "legitimate authorities on the subject." (Nizkor.org) Some of them are distinguished scientists and even Nobel laureates, but they have not read the literature and the assertions they make about the experiments range from wrong to ridiculous, so they have no business discussing it.