No, Harriman has not endorsed the theory, nor am I aware of his awareness of it. As for Wikipedia, you should know that a handful of trolls have dominated that entry for years. Any attempts by supporters to edit it get immediately snuffed. From the book:
I occasionally made attempts to seed the article into a more encyclopedic structure. I didn’t want to see it become laudatory, nor did I want it to rely on the off–hand remarks quoted in the Village Voice over genuine scientific data. But my attempts were in vain; my contributions dissolved into the ether, cut and pasted and editorialized.
By 2008, any edits that were not clearly critical of BLP, regardless of their factual content, would be reverted within minutes of posting, usually by one of only a few editors.
Welcome, I thought to myself, to the age of crowd–sourced knowledge.
Some years later, I made a renewed attempt. I focused my efforts on the goal of offering one crucial fact that could drastically alter the perception of Mills in the article (and thus, in the wider scientific community). The crucial fact? That Mills and his team had published over a hundred experimental papers in peer–reviewed scientific journals. After all, the question: “Is it published?” is the first question we ask of any scientific proposal. This is not a value judgment of any kind, it is simply a fact, but with huge implications: Mills was pursuing traditional outlets for his research, and on an ambitious scale, with papers spread over two dozen well–read journals. It would also beg the question in the article: was anyone responding to his actual research, or were they responding only to what had been said about Mills in the popular press?
Brett Holverstott. Randell Mills and the Search for Hydrino Energy (Kindle Locations 2574-2585). KRPHistory. Kindle Edition.
You really need to read the book to get the inside scoop and to learn of the many competent scientists who have achieved results supporting the model.
The libel has grown so bad on the Wikipedia article that Mills and company have filed a lawsuit to learn the identities of the anonymous coward trolls continuing the public defamation.