I don't know if you ever did research or not. As a person in academic area for a long time, I believe that many of the ideas against He are not reliable. It is true that He is not doing research now, but I think it is understandable that he is in the 70s to 80s. I found lots of papers published by He, that are good evidences of his academic abilities. You can find them through www.xys.org. I believe that Fang Zhouzi's reputation as an honest man is reliable.