I personally think that if a person wants to know if someone is credible and has the skill to give advice, it is up to that person to research and verify the information given. If the information can be verified independantly,this points directly to credibility. Hv has shown time and time again that all his advice can be verified scientifically and independantly.
I asked for credible evidence of a moreless post, on his forum, as I had researched his theory and could find nothing to back the information he posted. He answered my question by being extremely rude, and giving links to his own posts.
ML has also been exposed as a plagerist, using information taken from websites, written by others and passed off as his own, without any credit to the author or even a link to the site. This also points directly to credibility.
I don't hold anyones posting history against them, if your question is genuine, you have received your answer. If you want to check someones credibility, do your homework and read through the past posts, and test the veracity of Hv, or anyone else's advice for yourself.